v1.3.0 - Control, Closure, and Concatenation

User improvements:

• stimcirq can now convert in both directions, and preserves circuit moment structure when converting
• stim.TableauSimulator is easier to control and inspect
  • Truncate the state using stim.TableauSimulator.set_num_qubits
  • Replace the state using stim.TableauSimulator.set_inverse_tableau
  • Recognize single qubit stabilizer states non-destructively using stim.TableauSimulator.peek_bloch
  • Get state stabilizers in a standard form using stim.TableauSimulator.canonical_stabilizers
  • Guide measurement results after the fact using stim.TableauSimulator.measure_kickback
• stim.PauliString is now closed under multiplication
  • stim.PauliString.sign is now allowed to be 1j or -1j
  • Added allow_imaginary=False parameter to stim.PauliString.random
  • Multiplying anti-commuting Pauli strings now produces a result instead of an error
• stim.PauliString and stim.Tableau now support concatenation via + and/or *
  • Adding stim.PauliStrings concatenates them (computes their tensor product)
  • Adding stim.Tableaus concatenates them (computes their direct sum)
  • Multiplying stim.PauliString self-concatenates a variable number of times
• Mutable semantics have been improved
  • stim.PauliString now has a *= operator that works inline
  • Added copy methods to stim.{Circuit,Tableau,PauliString,TableauSimulator}
• Bug fixes
  • Fixed stim.TableauSimulator.measure reading invalid memory when applied to a qubit that hadn't been touched yet
  • Fixed import stim failing in some environments due to a unicode docstring not being marked as UTF8 (#20)
  • Fixed stim.TableauSimulator.cnot and other controlled operation methods failing when given a classical control
  • Worked around a bug in std::random_device in some environments (#26)

Dev improvements:

• Added a test command to cibuildwheel, so continuous integration now confirms tests pass on multiple platforms
• Fixed stimcirq doctests being skipped