Interop
Conversions to and from Qiskit, Cirq and Stim.
Every converter imports its framework lazily and raises
MissingDependencyError with an install hint if it is
missing. Qubit i of the source maps to qsimlab qubit i (Qiskit: the
circuit's qubit order; Cirq: sorted(circuit.all_qubits()) unless
qubit_order is given; Stim: qubit index). Global phases are kept.
Note on Cirq: Cirq's state vectors are big-endian (first qubit most significant) while qsimlab's are little-endian, so the same circuit gives bit-reversed state-vector indices; gates and samples per qubit agree.
from_qiskit(qc: Any, *, transpile: bool = True) -> Circuit
Converts a qiskit.QuantumCircuit.
The circuit is first transpiled (optimization_level=0, no coupling map, so
no qubit relabelling) to the engine's native basis, then exchanged as
OpenQASM 2; the global phase is carried over. Parameters must be bound.
Measurements become records in program order (measurement k = column k
of SamplesResult, whatever classical bit Qiskit wrote).
to_qiskit(circuit: Circuit) -> Any
Converts to a qiskit.QuantumCircuit (via OpenQASM 2, global phase kept).
Conditionals and noise channels have no OpenQASM 2 form and raise
UnsupportedOperationError.
from_cirq(
circuit: Any,
*,
qubit_order: Optional[Sequence[Any]] = None,
) -> Circuit
Converts a cirq.Circuit exactly (global phase included).
Standard gates map directly; other unitary operations are decomposed by Cirq,
with single-qubit pieces synthesised exactly as u gates and the global
phase corrected against cirq.unitary. Measurements, resets, bit/phase-flip
and depolarizing channels and simple classical controls (one single-qubit
measurement key, condition "== 1") are supported. Symbols must be resolved.
to_cirq(circuit: Circuit) -> Any
Converts to a cirq.Circuit on cirq.LineQubit(0..n-1).
Measurement k gets key "m{k}"; c_if=(k, 1) becomes a classical
control on "m{k}" (c_if=(k, 0) raises); the global phase becomes a
global-phase operation.