Fix Aer tutorials

tutorials/simulators/2_device_noise_simulation.ipynb

@@ -299,7 +299,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.7"
+   "version": "3.6.8"
   },
   "varInspector": {
    "cols": {

tutorials/simulators/7_matrix_product_state_method.ipynb

@@ -47,7 +47,7 @@
    "metadata": {},
    "source": [
     "## Using the matrix product state simulation method\n",
-    "The matrix product state simulation method is invoked in the `QasmSimulator` by setting the `simulation_method`. \n",
+    "The matrix product state simulation method is invoked in the `QasmSimulator` by setting the simulation method. \n",
     "Other than that, all operations are controlled by the `QasmSimulator` itself, as in the following example:"
    ]
   },
@@ -65,7 +65,7 @@
     {
      "data": {
       "text/plain": [
-       "{'11': 532, '00': 492}"
+       "{'00': 519, '11': 505}"
       ]
      },
      "execution_count": 1,
@@ -78,7 +78,7 @@
     "\n",
     "# Import Qiskit\n",
     "from qiskit import QuantumCircuit, QuantumRegister, ClassicalRegister\n",
-    "from qiskit import Aer, execute\n",
+    "from qiskit import execute\n",
     "from qiskit.providers.aer import QasmSimulator\n",
     "\n",
     "# Construct quantum circuit\n",
@@ -88,13 +88,10 @@
     "circ.measure([0,1], [0,1])\n",
     "\n",
     "# Select the QasmSimulator from the Aer provider\n",
-    "simulator = Aer.get_backend('qasm_simulator')\n",
-    "\n",
-    "# Define the simulation method\n",
-    "backend_opts_mps = {\"method\":\"matrix_product_state\"}\n",
+    "simulator = QasmSimulator(method='matrix_product_state')\n",
     "\n",
     "# Execute and get counts, using the matrix_product_state method\n",
-    "result = execute(circ, simulator, backend_options=backend_opts_mps).result()\n",
+    "result = execute(circ, simulator).result()\n",
     "counts = result.get_counts(circ)\n",
     "counts"
    ]
@@ -117,7 +114,6 @@
    },
    "outputs": [],
    "source": [
-    "from qiskit.extensions.simulator import Snapshot\n",
     "from qiskit.extensions.simulator.snapshot import snapshot"
    ]
   },
@@ -134,7 +130,7 @@
     {
      "data": {
       "text/plain": [
-       "[(0.7071067811865475+0j), 0j, 0j, (0.7071067811865475+0j)]"
+       "array([0.70710678+0.j, 0.        +0.j, 0.        +0.j, 0.70710678+0.j])"
       ]
      },
      "execution_count": 3,
@@ -152,7 +148,7 @@
     "circ.measure([0,1], [0,1])\n",
     "\n",
     "# Execute\n",
-    "job_sim = execute([circ], QasmSimulator(), backend_options=backend_opts_mps)\n",
+    "job_sim = execute(circ, simulator)\n",
     "result = job_sim.result()\n",
     "\n",
     "#print the state vector\n",
@@ -172,7 +168,7 @@
     {
      "data": {
       "text/plain": [
-       "{'11': 516, '00': 508}"
+       "{'00': 520, '11': 504}"
       ]
      },
      "execution_count": 4,
@@ -208,14 +204,14 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Time taken: 0.677933931350708 sec\n"
+      "Time taken: 0.5306055545806885 sec\n"
      ]
     },
     {
      "data": {
       "text/plain": [
-       "{'11111111111111111111111111111111111111111111111111': 543,\n",
-       " '00000000000000000000000000000000000000000000000000': 481}"
+       "{'00000000000000000000000000000000000000000000000000': 484,\n",
+       " '11111111111111111111111111111111111111111111111111': 540}"
       ]
      },
      "execution_count": 5,
@@ -225,19 +221,17 @@
    ],
    "source": [
     "num_qubits = 50\n",
-    "qr = QuantumRegister(num_qubits)\n",
-    "cr = ClassicalRegister(num_qubits)\n",
-    "circ = QuantumCircuit(qr, cr)\n",
+    "circ = QuantumCircuit(num_qubits, num_qubits)\n",
     "\n",
     "# Create EPR state\n",
-    "circ.h(qr[0])\n",
-    "for i in range (0,num_qubits-1):\n",
-    "    circ.cx(qr[i], qr[i+1])\n",
+    "circ.h(0)\n",
+    "for i in range (0, num_qubits-1):\n",
+    "    circ.cx(i, i+1)\n",
     "\n",
     "# Measure\n",
-    "circ.measure(qr, cr)\n",
+    "circ.measure(range(num_qubits), range(num_qubits))\n",
     "\n",
-    "job_sim = execute([circ], QasmSimulator(), backend_options=backend_opts_mps)\n",
+    "job_sim = execute(circ, simulator)\n",
     "result = job_sim.result()\n",
     "print(\"Time taken: {} sec\".format(result.time_taken))\n",
     "result.get_counts()"
@@ -256,8 +250,8 @@
     {
      "data": {
       "text/html": [
-       "<h3>Version Information</h3><table><tr><th>Qiskit Software</th><th>Version</th></tr><tr><td>Qiskit</td><td>0.19.6</td></tr><tr><td>Terra</td><td>0.14.2</td></tr><tr><td>Aer</td><td>0.5.2</td></tr><tr><td>Ignis</td><td>0.3.3</td></tr><tr><td>Aqua</td><td>0.7.3</td></tr><tr><td>IBM Q Provider</td><td>0.7.2</td></tr><tr><th>System information</th></tr><tr><td>Python</td><td>3.8.5 (default, Jul 27 2020, 08:42:51) \n",
-       "[GCC 10.1.0]</td></tr><tr><td>OS</td><td>Linux</td></tr><tr><td>CPUs</td><td>32</td></tr><tr><td>Memory (Gb)</td><td>125.72603988647461</td></tr><tr><td colspan='2'>Mon Aug 10 13:36:15 2020 EDT</td></tr></table>"
+       "<h3>Version Information</h3><table><tr><th>Qiskit Software</th><th>Version</th></tr><tr><td>Qiskit</td><td>0.23.0</td></tr><tr><td>Terra</td><td>0.16.0</td></tr><tr><td>Aer</td><td>0.7.0</td></tr><tr><td>Ignis</td><td>0.5.0</td></tr><tr><td>Aqua</td><td>0.8.0</td></tr><tr><td>IBM Q Provider</td><td>0.11.0</td></tr><tr><th>System information</th></tr><tr><td>Python</td><td>3.6.8 |Anaconda, Inc.| (default, Dec 30 2018, 01:22:34) \n",
+       "[GCC 7.3.0]</td></tr><tr><td>OS</td><td>Linux</td></tr><tr><td>CPUs</td><td>8</td></tr><tr><td>Memory (Gb)</td><td>62.916805267333984</td></tr><tr><td colspan='2'>Thu Nov 05 08:56:38 2020 IST</td></tr></table>"
       ],
       "text/plain": [
        "<IPython.core.display.HTML object>"
@@ -309,7 +303,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.5"
+   "version": "3.6.8"
   },
   "varInspector": {
    "cols": {