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<a href="QuEST__cpu_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Distributed under MIT licence. See https://github.com/QuEST-Kit/QuEST/blob/master/LICENCE.txt for details </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor"># include "<a class="code" href="QuEST_8h.html">QuEST.h</a>"</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor"># include "<a class="code" href="QuEST__internal_8h.html">QuEST_internal.h</a>"</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor"># include "<a class="code" href="QuEST__precision_8h.html">QuEST_precision.h</a>"</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor"># include "<a class="code" href="mt19937ar_8h.html">mt19937ar.h</a>"</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor"># include "<a class="code" href="QuEST__cpu__internal_8h.html">QuEST_cpu_internal.h</a>"</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor"># include <math.h></span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"># include <stdio.h></span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"># include <stdlib.h></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"># include <stdint.h></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"># include <assert.h></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor"># include <omp.h></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * overloads for consistent API with GPU </span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  </div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="group__debug.html#ga11448560006dd165128e404b54ebb2f7"> 36</a></span> <span class="keywordtype">void</span> <a class="code" href="group__debug.html#ga11448560006dd165128e404b54ebb2f7">copyStateToGPU</a>(<a class="code" href="structQureg.html">Qureg</a> qureg) {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="group__debug.html#ga924ef2dbda6b733b4041270077c76ece"> 39</a></span> <span class="keywordtype">void</span> <a class="code" href="group__debug.html#ga924ef2dbda6b733b4041270077c76ece">copyStateFromGPU</a>(<a class="code" href="structQureg.html">Qureg</a> qureg) {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> }</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * state vector and density matrix operations</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a717a0448066831cb5b392bcf2e1d0529"> 48</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a717a0448066831cb5b392bcf2e1d0529">densmatr_oneQubitDegradeOffDiagonal</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain){</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMask = 1LL << targetQubit;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMask = 1LL << (targetQubit + (qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPattern;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMask = innerMask|outerMask;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"> shared (innerMask,outerMask,totMask,qureg,retain,numTasks, targetQubit) \</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor"> private (thisTask,thisPattern)</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  thisPattern = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMask;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> ((thisPattern==innerMask) || (thisPattern==outerMask)){</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// do dephase</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// the lines below will degrade the off-diagonal terms |..0..><..1..| and |..1..><..0..|</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask]; </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask]; </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  } </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  } </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#aa31f0ef43a921c3ac73545d1d3670fa1"> 79</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#aa31f0ef43a921c3ac73545d1d3670fa1">densmatr_mixDephasing</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dephase) {</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain=1-dephase;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="QuEST__cpu_8c.html#a717a0448066831cb5b392bcf2e1d0529">densmatr_oneQubitDegradeOffDiagonal</a>(qureg, targetQubit, retain);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a623e577b7230f3c8dc202be6185b4289"> 84</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a623e577b7230f3c8dc202be6185b4289">densmatr_mixTwoQubitDephasing</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> qubit1, <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dephase) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain=1-dephase;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit1 = 1LL << qubit1;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit1 = 1LL << (qubit1 + (qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit2 = 1LL << qubit2;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit2 = 1LL << (qubit2 + (qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit1 = innerMaskQubit1|outerMaskQubit1;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit2 = innerMaskQubit2|outerMaskQubit2;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPatternQubit1, thisPatternQubit2;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor"> shared (innerMaskQubit1,outerMaskQubit1,totMaskQubit1,innerMaskQubit2,outerMaskQubit2, \</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="preprocessor"> totMaskQubit2,qureg,retain,numTasks) \</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="preprocessor"> private (thisTask,thisPatternQubit1,thisPatternQubit2)</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  thisPatternQubit1 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit1;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  thisPatternQubit2 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit2;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// any mismatch |...0...><...1...| etc</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> ( (thisPatternQubit1==innerMaskQubit1) || (thisPatternQubit1==outerMaskQubit1) || </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  (thisPatternQubit2==innerMaskQubit2) || (thisPatternQubit2==outerMaskQubit2) ){ </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// do dephase</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// the lines below will degrade the off-diagonal terms |..0..><..1..| and |..1..><..0..|</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask]; </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask]; </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  } </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  } </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> }</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  </div>
<div class="line"><a name="l00125"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#ab750fb47da2fca9849c678c869e40e69"> 125</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#ab750fb47da2fca9849c678c869e40e69">densmatr_mixDepolarisingLocal</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> depolLevel) {</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain=1-depolLevel;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMask = 1LL << targetQubit;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMask = 1LL << (targetQubit + (qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMask = innerMask|outerMask;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> partner;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPattern;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> realAv, imagAv;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="preprocessor"> shared (innerMask,outerMask,totMask,qureg,retain,depolLevel,numTasks) \</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="preprocessor"> private (thisTask,partner,thisPattern,realAv,imagAv)</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  thisPattern = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMask;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">if</span> ((thisPattern==innerMask) || (thisPattern==outerMask)){</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// do dephase</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// the lines below will degrade the off-diagonal terms |..0..><..1..| and |..1..><..0..|</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask]; </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask]; </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">if</span> ((thisTask&totMask)==0){ <span class="comment">//this element relates to targetQubit in state 0</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">// do depolarise</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  partner = thisTask | totMask;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  realAv = (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] + qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner]) /2 ;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  imagAv = (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] + qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner]) /2 ;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] + depolLevel*realAv;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] + depolLevel*imagAv;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] + depolLevel*realAv;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] + depolLevel*imagAv;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  }</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  }</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  } </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> }</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  </div>
<div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#ab124a3a9956046bf9c0e1e3ae9171f42"> 174</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#ab124a3a9956046bf9c0e1e3ae9171f42">densmatr_mixDampingLocal</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> damping) {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain=1-damping;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dephase=sqrt(retain);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  </div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMask = 1LL << targetQubit;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMask = 1LL << (targetQubit + (qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMask = innerMask|outerMask;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> partner;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPattern;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  </div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">//qreal realAv, imagAv;</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  </div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="preprocessor"> shared (innerMask,outerMask,totMask,qureg,retain,damping,dephase,numTasks) \</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="preprocessor"> private (thisTask,partner,thisPattern)</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  {</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  thisPattern = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMask;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">if</span> ((thisPattern==innerMask) || (thisPattern==outerMask)){</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">// do dephase</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// the lines below will degrade the off-diagonal terms |..0..><..1..| and |..1..><..0..|</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = dephase*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask]; </div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = dephase*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask]; </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">if</span> ((thisTask&totMask)==0){ <span class="comment">//this element relates to targetQubit in state 0</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">// do depolarise</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  partner = thisTask | totMask;</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">//realAv = (qureg.stateVec.real[thisTask] + qureg.stateVec.real[partner]) /2 ;</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">//imagAv = (qureg.stateVec.imag[thisTask] + qureg.stateVec.imag[partner]) /2 ;</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] + damping*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner];</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] + damping*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner];</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  </div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner];</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner];</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  }</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  }</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  } </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> }</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  </div>
<div class="line"><a name="l00224"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#a88670d0e7cebe33f61c1dd98daa338b3"> 224</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a88670d0e7cebe33f61c1dd98daa338b3">densmatr_mixDepolarisingDistributed</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> depolLevel) {</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  </div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="comment">// first do dephase part. </span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="comment">// TODO -- this might be more efficient to do at the same time as the depolarise if we move to</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="comment">// iterating over all elements in the state vector for the purpose of vectorisation</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// TODO -- if we keep this split, move this function to densmatr_mixDepolarising()</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <a class="code" href="QuEST__cpu_8c.html#aa31f0ef43a921c3ac73545d1d3670fa1">densmatr_mixDephasing</a>(qureg, targetQubit, depolLevel);</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlock, sizeInnerHalfBlock;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterHalfColumn;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisInnerBlock, <span class="comment">// current block</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  thisIndexInInnerBlock; </div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordtype">int</span> outerBit; </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  </div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask; </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>1;</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  </div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  sizeInnerHalfBlock = 1LL << targetQubit; </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  sizeInnerBlock = 2LL * sizeInnerHalfBlock; </div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  sizeOuterColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  sizeOuterHalfColumn = sizeOuterColumn >> 1;</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="preprocessor"> shared (sizeInnerBlock,sizeInnerHalfBlock,sizeOuterColumn,sizeOuterHalfColumn, \</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="preprocessor"> qureg,depolLevel,numTasks,targetQubit) \</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="preprocessor"> private (thisTask,thisInnerBlock,thisOuterColumn,thisIndex,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="preprocessor"> thisIndexInInnerBlock,outerBit)</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  {</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  thisOuterColumn = thisTask / sizeOuterHalfColumn;</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  thisIndexInOuterColumn = thisTask&(sizeOuterHalfColumn-1); <span class="comment">// thisTask % sizeOuterHalfColumn</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  thisInnerBlock = thisIndexInOuterColumn/sizeInnerHalfBlock;</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  thisIndexInInnerBlock = thisTask&(sizeInnerHalfBlock-1); <span class="comment">// thisTask % sizeInnerHalfBlock</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlock*sizeInnerBlock </div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  + thisIndexInInnerBlock;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="comment">// check if we are in the upper or lower half of an outer block</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  outerBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  thisIndex += outerBit*(sizeInnerHalfBlock);</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  </div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="comment">// thisTask is the index of the pair element in pairStateVec</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  </div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  </div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="comment">// state[thisIndex] = (1-depolLevel)*state[thisIndex] + depolLevel*(state[thisIndex]</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="comment">// + pair[thisTask])/2</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] = (1-depolLevel)*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] +</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  depolLevel*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] + qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisTask])/2;</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  </div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] = (1-depolLevel)*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] +</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  depolLevel*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] + qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisTask])/2;</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  } </div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  } </div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> }</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  </div>
<div class="line"><a name="l00300"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#a8d9c19a3424f0ad89bfbfd920d65301d"> 300</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a8d9c19a3424f0ad89bfbfd920d65301d">densmatr_mixDampingDistributed</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> damping) {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> retain=1-damping;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> dephase=sqrt(1-damping);</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  </div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="comment">// multiply the off-diagonal (|0><1| and |1><0|) terms by sqrt(1-damping)</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <a class="code" href="QuEST__cpu_8c.html#a717a0448066831cb5b392bcf2e1d0529">densmatr_oneQubitDegradeOffDiagonal</a>(qureg, targetQubit, dephase);</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  </div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="comment">// below, we modify the diagonals terms which require |1><1| to |0><0| communication</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  </div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlock, sizeInnerHalfBlock;</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterHalfColumn;</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisInnerBlock, <span class="comment">// current block</span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  thisIndexInInnerBlock; </div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordtype">int</span> outerBit; </div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keywordtype">int</span> stateBit;</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  </div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask; </div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>1;</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  </div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  sizeInnerHalfBlock = 1LL << targetQubit; </div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  sizeInnerBlock = 2LL * sizeInnerHalfBlock; </div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  sizeOuterColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  sizeOuterHalfColumn = sizeOuterColumn >> 1;</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  </div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="preprocessor"> shared (sizeInnerBlock,sizeInnerHalfBlock,sizeOuterColumn,sizeOuterHalfColumn, \</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="preprocessor"> qureg,damping, retain, dephase, numTasks,targetQubit) \</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="preprocessor"> private (thisTask,thisInnerBlock,thisOuterColumn,thisIndex,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="preprocessor"> thisIndexInInnerBlock,outerBit, stateBit)</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  {</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  thisOuterColumn = thisTask / sizeOuterHalfColumn;</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  thisIndexInOuterColumn = thisTask&(sizeOuterHalfColumn-1); <span class="comment">// thisTask % sizeOuterHalfColumn</span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  thisInnerBlock = thisIndexInOuterColumn/sizeInnerHalfBlock;</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  thisIndexInInnerBlock = thisTask&(sizeInnerHalfBlock-1); <span class="comment">// thisTask % sizeInnerHalfBlock</span></div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlock*sizeInnerBlock </div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  + thisIndexInInnerBlock;</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="comment">// check if we are in the upper or lower half of an outer block</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  outerBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  thisIndex += outerBit*(sizeInnerHalfBlock);</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  </div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="comment">// thisTask is the index of the pair element in pairStateVec</span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  </div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="comment">// Extract state bit, is 0 if thisIndex corresponds to a state with 0 in the target qubit</span></div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="comment">// and is 1 if thisIndex corresponds to a state with 1 in the target qubit</span></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  stateBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>));</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  </div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="comment">// state[thisIndex] = (1-depolLevel)*state[thisIndex] + depolLevel*(state[thisIndex]</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="comment">// + pair[thisTask])/2</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <span class="keywordflow">if</span>(stateBit == 0){</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] +</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  damping*( qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisTask]);</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  </div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] +</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  damping*( qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisTask]);</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  } <span class="keywordflow">else</span>{</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex];</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  </div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] = retain*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex];</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  }</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  } </div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  } </div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> }</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  </div>
<div class="line"><a name="l00387"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#a3510f01d4d15dcc545564eb84c668cad"> 387</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a3510f01d4d15dcc545564eb84c668cad">densmatr_mixTwoQubitDepolarisingLocal</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> qubit1, <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> delta, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> gamma) {</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit1 = 1LL << qubit1;</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit1= 1LL << (qubit1 + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit1 = innerMaskQubit1 | outerMaskQubit1;</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit2 = 1LL << qubit2;</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit2 = 1LL << (qubit2 + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit2 = innerMaskQubit2 | outerMaskQubit2;</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  </div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> partner;</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPatternQubit1, thisPatternQubit2;</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  </div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> real00, imag00;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  </div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span> <span class="preprocessor"> shared (totMaskQubit1,totMaskQubit2,qureg,delta,gamma,numTasks) \</span></div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span> <span class="preprocessor"> private (thisTask,partner,thisPatternQubit1,thisPatternQubit2,real00,imag00)</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  {</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="comment">//--------------------------------------- STEP ONE ---------------------</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){ </div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  thisPatternQubit1 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit1;</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  thisPatternQubit2 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit2;</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="keywordflow">if</span> ((thisPatternQubit1==0) && ((thisPatternQubit2==0) </div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  || (thisPatternQubit2==totMaskQubit2))){ </div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="comment">//this element of form |...X...0...><...X...0...| for X either 0 or 1.</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  partner = thisTask | totMaskQubit1;</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  real00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask];</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  imag00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask];</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  </div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] </div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner];</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] </div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner];</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  </div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] + delta*real00;</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] + delta*imag00;</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  </div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  }</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  }</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  <span class="comment">//--------------------------------------- STEP TWO ---------------------</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){ </div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  thisPatternQubit1 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit1;</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  thisPatternQubit2 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit2;</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  <span class="keywordflow">if</span> ((thisPatternQubit2==0) && ((thisPatternQubit1==0) </div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  || (thisPatternQubit1==totMaskQubit1))){ </div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="comment">//this element of form |...0...X...><...0...X...| for X either 0 or 1.</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  partner = thisTask | totMaskQubit2;</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  real00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask];</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  imag00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask];</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  </div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] </div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner];</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] </div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner];</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  </div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] + delta*real00;</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] + delta*imag00;</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  </div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  }</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  }</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  </div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="comment">//--------------------------------------- STEP THREE ---------------------</span></div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++){ </div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  thisPatternQubit1 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit1;</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  thisPatternQubit2 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit2;</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keywordflow">if</span> ((thisPatternQubit2==0) && ((thisPatternQubit1==0) </div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  || (thisPatternQubit1==totMaskQubit1))){ </div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="comment">//this element of form |...0...X...><...0...X...| for X either 0 or 1.</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  partner = thisTask | totMaskQubit2;</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  partner = partner ^ totMaskQubit1;</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  real00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask];</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  imag00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask];</div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  </div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = gamma * (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] </div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner]);</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = gamma * (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] </div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner]);</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  </div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = gamma * (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] </div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  + delta*real00);</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = gamma * (qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] </div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  + delta*imag00);</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  </div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  }</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  }</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  }</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span> }</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  </div>
<div class="line"><a name="l00488"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#ae90f82418e0aa67218d733dbbc681998"> 488</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#ae90f82418e0aa67218d733dbbc681998">densmatr_mixTwoQubitDepolarisingLocalPart1</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> qubit1, <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> delta) {</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit1 = 1LL << qubit1;</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit1= 1LL << (qubit1 + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit1 = innerMaskQubit1 | outerMaskQubit1;</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerMaskQubit2 = 1LL << qubit2;</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerMaskQubit2 = 1LL << (qubit2 + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> totMaskQubit2 = innerMaskQubit2 | outerMaskQubit2;</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <span class="comment">// correct for being in a particular chunk</span></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="comment">//totMaskQubit2 = totMaskQubit2&(qureg.numAmpsPerChunk-1); // totMaskQubit2 % numAmpsPerChunk</span></div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  </div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  </div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask;</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> partner;</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisPatternQubit1, thisPatternQubit2;</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  </div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> real00, imag00;</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  </div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span> <span class="preprocessor"> shared (totMaskQubit1,totMaskQubit2,qureg,delta,numTasks) \</span></div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> <span class="preprocessor"> private (thisTask,partner,thisPatternQubit1,thisPatternQubit2,real00,imag00)</span></div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  {</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  </div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  <span class="comment">//--------------------------------------- STEP ONE ---------------------</span></div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask ++){ </div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  thisPatternQubit1 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit1;</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  thisPatternQubit2 = (thisTask+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)&totMaskQubit2;</div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keywordflow">if</span> ((thisPatternQubit1==0) && ((thisPatternQubit2==0) </div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  || (thisPatternQubit2==totMaskQubit2))){ </div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="comment">//this element of form |...X...0...><...X...0...| for X either 0 or 1.</span></div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  partner = thisTask | totMaskQubit1;</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  real00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask];</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  imag00 = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask];</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  </div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisTask] </div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner];</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisTask] </div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  + delta*qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner];</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  </div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[partner] + delta*real00;</div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[partner] + delta*imag00;</div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  </div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  }</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  }</div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  }</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> }</div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  </div>
<div class="line"><a name="l00541"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#a2f76ec8f08e19bb8e1254aafb10e160e"> 541</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a2f76ec8f08e19bb8e1254aafb10e160e">densmatr_mixTwoQubitDepolarisingDistributed</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, </div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> delta, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> gamma) {</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  </div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ1, sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ2, sizeInnerHalfBlockQ2, sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisInnerBlockQ2,</div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  thisIndexInInnerBlockQ1, </div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  thisIndexInInnerBlockQ2, </div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  thisInnerBlockQ1InInnerBlockQ2;</div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  <span class="keywordtype">int</span> outerBitQ1, outerBitQ2; </div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  </div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask; </div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>2;</div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span>  </div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  sizeInnerHalfBlockQ1 = 1LL << targetQubit; </div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  sizeInnerHalfBlockQ2 = 1LL << qubit2; </div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  sizeInnerQuarterBlockQ2 = sizeInnerHalfBlockQ2 >> 1; </div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  sizeInnerBlockQ2 = sizeInnerHalfBlockQ2 << 1; </div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  sizeInnerBlockQ1 = 2LL * sizeInnerHalfBlockQ1; </div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  sizeOuterColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  sizeOuterQuarterColumn = sizeOuterColumn >> 2;</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  </div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span> <span class="preprocessor"> shared (sizeInnerBlockQ1,sizeInnerHalfBlockQ1,sizeInnerBlockQ2,sizeInnerHalfBlockQ2,sizeInnerQuarterBlockQ2,\</span></div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span> <span class="preprocessor"> sizeOuterColumn,sizeOuterQuarterColumn,qureg,delta,gamma,numTasks,targetQubit,qubit2) \</span></div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span> <span class="preprocessor"> private (thisTask,thisInnerBlockQ2,thisInnerBlockQ1InInnerBlockQ2, \</span></div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span> <span class="preprocessor"> thisOuterColumn,thisIndex,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span> <span class="preprocessor"> thisIndexInInnerBlockQ1,thisIndexInInnerBlockQ2,outerBitQ1,outerBitQ2)</span></div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  {</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  thisOuterColumn = thisTask / sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  <span class="comment">// thisTask % sizeOuterQuarterColumn</span></div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  thisIndexInOuterColumn = thisTask&(sizeOuterQuarterColumn-1); </div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  thisInnerBlockQ2 = thisIndexInOuterColumn / sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  <span class="comment">// thisTask % sizeInnerQuarterBlockQ2;</span></div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  thisIndexInInnerBlockQ2 = thisTask&(sizeInnerQuarterBlockQ2-1);</div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  thisInnerBlockQ1InInnerBlockQ2 = thisIndexInInnerBlockQ2 / sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  <span class="comment">// thisTask % sizeInnerHalfBlockQ1;</span></div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  thisIndexInInnerBlockQ1 = thisTask&(sizeInnerHalfBlockQ1-1);</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  </div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlockQ2*sizeInnerBlockQ2 </div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  + thisInnerBlockQ1InInnerBlockQ2*sizeInnerBlockQ1 + thisIndexInInnerBlockQ1;</div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  </div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q1</span></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  outerBitQ1 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  thisIndex += outerBitQ1*(sizeInnerHalfBlockQ1);</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  </div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q2</span></div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  outerBitQ2 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(qubit2, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  thisIndex += outerBitQ2*(sizeInnerQuarterBlockQ2<<1);</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  </div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="comment">// thisTask is the index of the pair element in pairStateVec</span></div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  </div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  </div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  <span class="comment">// state[thisIndex] = (1-depolLevel)*state[thisIndex] + depolLevel*(state[thisIndex]</span></div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  <span class="comment">// + pair[thisTask])/2</span></div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  <span class="comment">// NOTE: must set gamma=1 if using this function for steps 1 or 2</span></div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] = gamma*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] +</div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  delta*qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisTask]);</div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] = gamma*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] +</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  delta*qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisTask]);</div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  } </div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  } </div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span> }</div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  </div>
<div class="line"><a name="l00632"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#acabdfbd3184d3ab3bded61e24142b800"> 632</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#acabdfbd3184d3ab3bded61e24142b800">densmatr_mixTwoQubitDepolarisingQ1LocalQ2DistributedPart3</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> targetQubit, </div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  <span class="keywordtype">int</span> qubit2, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> delta, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> gamma) {</div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  </div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ1, sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeInnerBlockQ2, sizeInnerHalfBlockQ2, sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> sizeOuterColumn, sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisInnerBlockQ2,</div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  thisOuterColumn, <span class="comment">// current column in density matrix</span></div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  thisIndex, <span class="comment">// current index in (density matrix representation) state vector</span></div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  thisIndexInPairVector,</div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  thisIndexInOuterColumn,</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  thisIndexInInnerBlockQ1, </div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  thisIndexInInnerBlockQ2, </div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  thisInnerBlockQ1InInnerBlockQ2;</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  <span class="keywordtype">int</span> outerBitQ1, outerBitQ2; </div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  </div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> thisTask; </div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numTasks=qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>>>2;</div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  </div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  <span class="comment">// set dimensions</span></div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  sizeInnerHalfBlockQ1 = 1LL << targetQubit; </div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  sizeInnerHalfBlockQ2 = 1LL << qubit2; </div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  sizeInnerQuarterBlockQ2 = sizeInnerHalfBlockQ2 >> 1; </div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  sizeInnerBlockQ2 = sizeInnerHalfBlockQ2 << 1; </div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  sizeInnerBlockQ1 = 2LL * sizeInnerHalfBlockQ1; </div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  sizeOuterColumn = 1LL << qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>;</div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  sizeOuterQuarterColumn = sizeOuterColumn >> 2;</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  </div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span> <span class="comment">//# if 0</span></div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span> <span class="preprocessor"> shared (sizeInnerBlockQ1,sizeInnerHalfBlockQ1,sizeInnerBlockQ2,sizeInnerHalfBlockQ2,sizeInnerQuarterBlockQ2,\</span></div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span> <span class="preprocessor"> sizeOuterColumn,sizeOuterQuarterColumn,qureg,delta,gamma, numTasks,targetQubit,qubit2) \</span></div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span> <span class="preprocessor"> private (thisTask,thisInnerBlockQ2,thisInnerBlockQ1InInnerBlockQ2, \</span></div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span> <span class="preprocessor"> thisOuterColumn,thisIndex,thisIndexInPairVector,thisIndexInOuterColumn, \</span></div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span> <span class="preprocessor"> thisIndexInInnerBlockQ1,thisIndexInInnerBlockQ2,outerBitQ1,outerBitQ2)</span></div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  {</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span> <span class="comment">//# endif</span></div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="comment">// thisTask iterates over half the elements in this process' chunk of the density matrix</span></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  <span class="comment">// treat this as iterating over all columns, then iterating over half the values</span></div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  <span class="comment">// within one column.</span></div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="comment">// If this function has been called, this process' chunk contains half an </span></div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  <span class="comment">// outer block or less</span></div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  <span class="keywordflow">for</span> (thisTask=0; thisTask<numTasks; thisTask++) {</div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  <span class="comment">// we want to process all columns in the density matrix,</span></div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  <span class="comment">// updating the values for half of each column (one half of each inner block)</span></div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  thisOuterColumn = thisTask / sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  <span class="comment">// thisTask % sizeOuterQuarterColumn</span></div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  thisIndexInOuterColumn = thisTask&(sizeOuterQuarterColumn-1); </div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  thisInnerBlockQ2 = thisIndexInOuterColumn / sizeInnerQuarterBlockQ2;</div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="comment">// thisTask % sizeInnerQuarterBlockQ2;</span></div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  thisIndexInInnerBlockQ2 = thisTask&(sizeInnerQuarterBlockQ2-1);</div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  thisInnerBlockQ1InInnerBlockQ2 = thisIndexInInnerBlockQ2 / sizeInnerHalfBlockQ1;</div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  <span class="comment">// thisTask % sizeInnerHalfBlockQ1;</span></div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  thisIndexInInnerBlockQ1 = thisTask&(sizeInnerHalfBlockQ1-1);</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  </div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  <span class="comment">// get index in state vector corresponding to upper inner block</span></div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  thisIndex = thisOuterColumn*sizeOuterColumn + thisInnerBlockQ2*sizeInnerBlockQ2 </div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  + thisInnerBlockQ1InInnerBlockQ2*sizeInnerBlockQ1 + thisIndexInInnerBlockQ1;</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  </div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q1</span></div>
<div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  outerBitQ1 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(targetQubit, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  thisIndex += outerBitQ1*(sizeInnerHalfBlockQ1);</div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  </div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  <span class="comment">// For part 3 we need to match elements such that (my Q1 != pair Q1) AND (my Q2 != pair Q2)</span></div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  <span class="comment">// Find correct index in pairStateVector</span></div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  thisIndexInPairVector = thisTask + (1-outerBitQ1)*sizeInnerHalfBlockQ1*sizeOuterQuarterColumn -</div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  outerBitQ1*sizeInnerHalfBlockQ1*sizeOuterQuarterColumn;</div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  </div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  <span class="comment">// check if we are in the upper or lower half of an outer block for Q2</span></div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  outerBitQ2 = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(qubit2, (thisIndex+qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>*qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a>)>>qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>);</div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  <span class="comment">// if we are in the lower half of an outer block, shift to be in the lower half</span></div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  <span class="comment">// of the inner block as well (we want to dephase |0><0| and |1><1| only)</span></div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  thisIndex += outerBitQ2*(sizeInnerQuarterBlockQ2<<1);</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  </div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  </div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  <span class="comment">// NOTE: at this point thisIndex should be the index of the element we want to </span></div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  <span class="comment">// dephase in the chunk of the state vector on this process, in the </span></div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  <span class="comment">// density matrix representation. </span></div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  </div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  </div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <span class="comment">// state[thisIndex] = (1-depolLevel)*state[thisIndex] + depolLevel*(state[thisIndex]</span></div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  <span class="comment">// + pair[thisIndexInPairVector])/2</span></div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] = gamma*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[thisIndex] +</div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  delta*qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.real[thisIndexInPairVector]);</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  </div>
<div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] = gamma*(qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[thisIndex] +</div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  delta*qureg.<a class="code" href="structQureg.html#aba97773694870ef35e378c036f486bb7">pairStateVec</a>.imag[thisIndexInPairVector]);</div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  } </div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  } </div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  </div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span> }</div>
<div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  </div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  </div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span> <span class="comment">/* Without nested parallelisation, only the outer most loops which call below are parallelised */</span></div>
<div class="line"><a name="l00734"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458"> 734</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> startInd, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps) {</div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span> <span class="preprocessor"># pragma omp parallel for schedule (static)</span></div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00739"></a><span class="lineno"> 739</span>  <span class="keywordflow">for</span> (i=startInd; i < startInd+numAmps; i++) {</div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[i] = 0;</div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[i] = 0;</div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  }</div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span> }</div>
<div class="line"><a name="l00744"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a031a99b7e97779f3dc782feffe86e779"> 744</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a031a99b7e97779f3dc782feffe86e779">normaliseSomeAmps</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> norm, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> startInd, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps) {</div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> i;</div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span> <span class="preprocessor"># pragma omp parallel for schedule (static)</span></div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  <span class="keywordflow">for</span> (i=startInd; i < startInd+numAmps; i++) {</div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real[i] /= norm;</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag[i] /= norm;</div>
<div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  }</div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span> }</div>
<div class="line"><a name="l00754"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a0abdff5f6065f9d57065345e6d90fc94"> 754</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a0abdff5f6065f9d57065345e6d90fc94">alternateNormZeroingSomeAmpBlocks</a>(</div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  <a class="code" href="structQureg.html">Qureg</a> qureg, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> norm, <span class="keywordtype">int</span> normFirst, </div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> startAmpInd, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps, <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> blockSize</div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span> ) { </div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numDubBlocks = numAmps / (2*blockSize);</div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> blockStartInd;</div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  </div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  <span class="keywordflow">if</span> (normFirst) {</div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> dubBlockInd;</div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span> <span class="preprocessor"># pragma omp parallel for schedule (static) private (blockStartInd)</span></div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  <span class="keywordflow">for</span> (dubBlockInd=0; dubBlockInd < numDubBlocks; dubBlockInd++) {</div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  blockStartInd = startAmpInd + dubBlockInd*2*blockSize;</div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  <a class="code" href="QuEST__cpu_8c.html#a031a99b7e97779f3dc782feffe86e779">normaliseSomeAmps</a>(qureg, norm, blockStartInd, blockSize); <span class="comment">// |0><0|</span></div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>( qureg, blockStartInd + blockSize, blockSize);</div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  }</div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> dubBlockInd;</div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span> <span class="preprocessor"># pragma omp parallel for schedule (static) private (blockStartInd)</span></div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  <span class="keywordflow">for</span> (dubBlockInd=0; dubBlockInd < numDubBlocks; dubBlockInd++) {</div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  blockStartInd = startAmpInd + dubBlockInd*2*blockSize;</div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>( qureg, blockStartInd, blockSize);</div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  <a class="code" href="QuEST__cpu_8c.html#a031a99b7e97779f3dc782feffe86e779">normaliseSomeAmps</a>(qureg, norm, blockStartInd + blockSize, blockSize); <span class="comment">// |1><1|</span></div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  }</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  }</div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span> }</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  </div>
<div class="line"><a name="l00785"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a8a639c31701d989a5db7aa1f6b13db60"> 785</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a8a639c31701d989a5db7aa1f6b13db60">densmatr_collapseToKnownProbOutcome</a>(<a class="code" href="structQureg.html">Qureg</a> qureg, <span class="keywordtype">int</span> measureQubit, <span class="keywordtype">int</span> outcome, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> totalStateProb) {</div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span>  </div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  <span class="comment">// only (global) indices (as bit sequence): '* outcome *(n+q) outcome *q are spared</span></div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  <span class="comment">// where n = measureQubit, q = qureg.numQubitsRepresented.</span></div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  <span class="comment">// We can thus step in blocks of 2^q+n, killing every second, and inside the others,</span></div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  <span class="comment">// stepping in sub-blocks of 2^q, killing every second.</span></div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  <span class="comment">// When outcome=1, we offset the start of these blocks by their size.</span></div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> innerBlockSize = (1LL << measureQubit);</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerBlockSize = (1LL << (measureQubit + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>));</div>
<div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  </div>
<div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  <span class="comment">// Because there are 2^a number of nodes(/chunks), each node will contain 2^b number of blocks,</span></div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  <span class="comment">// or each block will span 2^c number of nodes. Similarly for the innerblocks.</span></div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> locNumAmps = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> globalStartInd = qureg.<a class="code" href="structQureg.html#ac2929e681d3d95591c18cf168dbbe4f0">chunkId</a> * locNumAmps;</div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  <span class="keywordtype">int</span> innerBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(measureQubit, globalStartInd);</div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  <span class="keywordtype">int</span> outerBit = <a class="code" href="QuEST__gpu_8cu.html#aec1852e1a8e70d3690919ce8ab551ba0">extractBit</a>(measureQubit + qureg.<a class="code" href="structQureg.html#ad08dff5316b8937f4b2a1417591543dc">numQubitsRepresented</a>, globalStartInd);</div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  </div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  <span class="comment">// If this chunk's amps are entirely inside an outer block</span></div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  <span class="keywordflow">if</span> (locNumAmps <= outerBlockSize) {</div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  </div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  <span class="comment">// if this is an undesired outer block, kill all elems</span></div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  <span class="keywordflow">if</span> (outerBit != outcome)</div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  <span class="keywordflow">return</span> <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>(qureg, 0, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>);</div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  </div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  <span class="comment">// othwerwise, if this is a desired outer block, and also entirely an inner block</span></div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  <span class="keywordflow">if</span> (locNumAmps <= innerBlockSize) {</div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  </div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="comment">// and that inner block is undesired, kill all elems</span></div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  <span class="keywordflow">if</span> (innerBit != outcome)</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  <span class="keywordflow">return</span> <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>(qureg, 0, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>);</div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  <span class="comment">// otherwise normalise all elems</span></div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  <span class="keywordflow">return</span> <a class="code" href="QuEST__cpu_8c.html#a031a99b7e97779f3dc782feffe86e779">normaliseSomeAmps</a>(qureg, totalStateProb, 0, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>);</div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  }</div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  </div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  <span class="comment">// otherwise this is a desired outer block which contains 2^a inner blocks; kill/renorm every second inner block</span></div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  <span class="keywordflow">return</span> <a class="code" href="QuEST__cpu_8c.html#a0abdff5f6065f9d57065345e6d90fc94">alternateNormZeroingSomeAmpBlocks</a>(</div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  qureg, totalStateProb, innerBit==outcome, 0, qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>, innerBlockSize);</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  }</div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  </div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  <span class="comment">// Otherwise, this chunk's amps contain multiple outer blocks (and hence multiple inner blocks)</span></div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numOuterDoubleBlocks = locNumAmps / (2*outerBlockSize);</div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> firstBlockInd;</div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  </div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  <span class="comment">// alternate norming* and zeroing the outer blocks (with order based on the desired outcome)</span></div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <span class="comment">// These loops aren't parallelised, since they could have 1 or 2 iterations and will prevent</span></div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  <span class="comment">// inner parallelisation</span></div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  <span class="keywordflow">if</span> (outerBit == outcome) {</div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  </div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  <span class="keywordflow">for</span> (<span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerDubBlockInd = 0; outerDubBlockInd < numOuterDoubleBlocks; outerDubBlockInd++) {</div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  firstBlockInd = outerDubBlockInd*2*outerBlockSize;</div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  </div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  <span class="comment">// *norm only the desired inner blocks in the desired outer block</span></div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  <a class="code" href="QuEST__cpu_8c.html#a0abdff5f6065f9d57065345e6d90fc94">alternateNormZeroingSomeAmpBlocks</a>(</div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  qureg, totalStateProb, innerBit==outcome, </div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  firstBlockInd, outerBlockSize, innerBlockSize);</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  </div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  <span class="comment">// zero the undesired outer block</span></div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>(qureg, firstBlockInd + outerBlockSize, outerBlockSize);</div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  }</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  </div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  </div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  <span class="keywordflow">for</span> (<span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> outerDubBlockInd = 0; outerDubBlockInd < numOuterDoubleBlocks; outerDubBlockInd++) {</div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  firstBlockInd = outerDubBlockInd*2*outerBlockSize;</div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  </div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="comment">// same thing but undesired outer blocks come first</span></div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <a class="code" href="QuEST__cpu_8c.html#ac5168399122f7f53977dcc9ceda4f458">zeroSomeAmps</a>(qureg, firstBlockInd, outerBlockSize);</div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  <a class="code" href="QuEST__cpu_8c.html#a0abdff5f6065f9d57065345e6d90fc94">alternateNormZeroingSomeAmpBlocks</a>(</div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  qureg, totalStateProb, innerBit==outcome, </div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  firstBlockInd + outerBlockSize, outerBlockSize, innerBlockSize);</div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  }</div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  }</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  </div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span> }</div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  </div>
<div class="line"><a name="l00861"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#af910c7cf2b85bdc2c399cfe8dbfb8b9c"> 861</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu_8c.html#af910c7cf2b85bdc2c399cfe8dbfb8b9c">densmatr_calcPurityLocal</a>(<a class="code" href="structQureg.html">Qureg</a> qureg) {</div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  </div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span>  <span class="comment">/* sum of qureg^2, which is sum_i |qureg[i]|^2 */</span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index;</div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps = qureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  </div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> trace = 0;</div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *vecRe = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *vecIm = qureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  </div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span> <span class="preprocessor"> shared (vecRe, vecIm, numAmps) \</span></div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span> <span class="preprocessor"> private (index) \</span></div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span> <span class="preprocessor"> reduction ( +:trace )</span></div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  {</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  <span class="keywordflow">for</span> (index=0LL; index<numAmps; index++) {</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  </div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  trace += vecRe[index]*vecRe[index] + vecIm[index]*vecIm[index];</div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  }</div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  }</div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  </div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  <span class="keywordflow">return</span> trace;</div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span> }</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  </div>
<div class="line"><a name="l00890"></a><span class="lineno"><a class="line" href="QuEST__cpu_8c.html#a8adaba9dbdad6f7ab41ae4b8db0abefe"> 890</a></span> <span class="keywordtype">void</span> <a class="code" href="QuEST__cpu_8c.html#a8adaba9dbdad6f7ab41ae4b8db0abefe">densmatr_mixDensityMatrix</a>(<a class="code" href="structQureg.html">Qureg</a> combineQureg, <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> otherProb, <a class="code" href="structQureg.html">Qureg</a> otherQureg) {</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  </div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  <span class="comment">/* corresponding amplitudes live on the same node (same dimensions) */</span></div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  </div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  <span class="comment">// unpack vars for OpenMP</span></div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* combineVecRe = combineQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* combineVecIm = combineQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* otherVecRe = otherQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a>* otherVecIm = otherQureg.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps = combineQureg.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index;</div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  </div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span> <span class="preprocessor"> default (none) \</span></div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span> <span class="preprocessor"> shared (combineVecRe,combineVecIm,otherVecRe,otherVecIm, otherProb, numAmps) \</span></div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span> <span class="preprocessor"> private (index)</span></div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  {</div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  <span class="keywordflow">for</span> (index=0; index < numAmps; index++) {</div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  combineVecRe[index] *= 1-otherProb;</div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  combineVecIm[index] *= 1-otherProb;</div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  </div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  combineVecRe[index] += otherProb * otherVecRe[index];</div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  combineVecIm[index] += otherProb * otherVecIm[index];</div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  }</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  }</div>
<div class="line"><a name="l00920"></a><span class="lineno"> 920</span> }</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  </div>
<div class="line"><a name="l00923"></a><span class="lineno"><a class="line" href="QuEST__cpu__internal_8h.html#a939897137596bb73ad7a028d0beaaa10"> 923</a></span> <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> <a class="code" href="QuEST__cpu_8c.html#a939897137596bb73ad7a028d0beaaa10">densmatr_calcHilbertSchmidtDistanceSquaredLocal</a>(<a class="code" href="structQureg.html">Qureg</a> a, <a class="code" href="structQureg.html">Qureg</a> b) {</div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  </div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> index;</div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  <span class="keywordtype">long</span> <span class="keywordtype">long</span> <span class="keywordtype">int</span> numAmps = a.<a class="code" href="structQureg.html#ab0ea0358482b62f43fdd781469607d97">numAmpsPerChunk</a>;</div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  </div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *aRe = a.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *aIm = a.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *bRe = b.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.real;</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> *bIm = b.<a class="code" href="structQureg.html#a441e4cacef6bd17adb9813c7442d42fe">stateVec</a>.imag;</div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  </div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> trace = 0;</div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  <a class="code" href="group__type.html#ga7740e349b4f8bae6451547680f0ce2d6">qreal</a> difRe, difIm;</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  </div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span> <span class="preprocessor"># pragma omp parallel \</span></div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span> <span class="preprocessor"> shared (aRe,aIm, bRe,bIm, numAmps) \</span></div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span> <span class="preprocessor"> private (index,difRe,difIm) \</span></div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span> <span class="preprocessor"> reduction ( +:trace )</span></div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span> <span class="preprocessor"># endif </span></div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  {</div>
<div class="line"><a name="l00943"></a><span class="lineno"> 943</span> <span class="preprocessor"># ifdef _OPENMP</span></div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span> <span class="preprocessor"># pragma omp for schedule (static)</span></div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  <span class="keywordflow">for</span> (index=0LL; index<numAmps; index++) {</div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  </div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  difRe = aRe[index] - bRe[index];</div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  difIm = aIm[index] - bIm[index];</div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  trace += difRe*difRe + difIm*difIm;</div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  }</div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  }</div>