Qiskit / qiskit / 20331603885

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Commit Message

Add Clifford circuit optimization to BasicSimulator (#15159)

* Add Clifford circuit optimization to BasicSimulator

- Implement _is_clifford_circuit() to detect Clifford circuits
- Implement _run_clifford_circuit() using StabilizerState for efficient simulation
- Fixes #13610

* Address code review feedback from alexanderivrii

- Use remove_final_measurements(inplace=False) for cleaner code
- Reorder checks: test initial_statevector first (cheaper operation)
- Refactor to avoid double Clifford construction by returning Clifford
  object from _is_clifford_circuit and reusing in _run_clifford_circuit

* Update docstring for _run_clifford_circuit

Add missing clifford_obj parameter documentation to docstring.

* Make Clifford optimization opt-in and fix StabilizerState performance

Add use_clifford_optimization flag (default False) and optimize state creation

* Improve Clifford optimization implementation

- Sample all shots at once with sample_memory()
- Create StabilizerState once per run
- Fix RNG seeding

* Add BasicSimulator Clifford limits, tests, and GHZ/random Clifford benchmarks

* Fix pylint issues in BasicSimulator benchmarks

* Add Qiskit copyright header to benchmarks

* Remove ad-hoc BasicSimulator benchmark scripts

* Update copyright header year in Clifford benchmarks

* Restore fast default BasicSimulator path and lighten statevector limit test

* Format BasicSimulator tests with black

* Restore original test_unitary from main

* Relax Bell-state Clifford test and keep BasicSimulator tests passing

* Remove leftover BasicProviderError comment and bump n_qubits to 32

* Update test/python/providers/basic_provider/test_basic_simulator.py

Co-authored-by: Alexander Ivrii <alexi@il.ibm.com>

* Update test/python/providers/basic_provider/test_basic_simulator.py

Co-authored-by: Alexander Ivrii <alexi@il.ibm.com>

* Remove BasicSimulator ASV benchmarks from Clifford optimization PR and Ensure 32-qubit Clifford test uses stabilizer path

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