Quellcode für qiskit.transpiler.passes.utils.gates_basis

# This code is part of Qiskit.
# (C) Copyright IBM 2017, 2018.
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

"""Check if all gates in the DAGCircuit are in the specified basis gates."""

from qiskit.circuit import ControlFlowOp
from qiskit.converters import circuit_to_dag
from qiskit.transpiler.basepasses import AnalysisPass

[Doku]class GatesInBasis(AnalysisPass): """Check if all gates in a DAG are in a given set of gates""" def __init__(self, basis_gates=None, target=None): """Initialize the GatesInBasis pass. Args: basis_gates (list): The list of strings representing the set of basis gates. target (Target): The target representing the backend. If specified this will be used instead of the ``basis_gates`` parameter """ super().__init__() self._basis_gates = None if basis_gates is not None: self._basis_gates = set(basis_gates).union( {"measure", "reset", "barrier", "snapshot", "delay"} ) self._target = target
[Doku] def run(self, dag): """Run the GatesInBasis pass on `dag`.""" if self._basis_gates is None and self._target is None: self.property_set["all_gates_in_basis"] = True return gates_out_of_basis = False if self._target is not None: def _visit_target(dag, wire_map): for gate in dag.op_nodes(): # Barrier is universal and supported by all backends if gate.name == "barrier": continue if not self._target.instruction_supported( gate.name, tuple(wire_map[bit] for bit in gate.qargs) ): return True # Control-flow ops still need to be supported, so don't skip them in the # previous checks. if isinstance(gate.op, ControlFlowOp): for block in gate.op.blocks: inner_wire_map = { inner: wire_map[outer] for outer, inner in zip(gate.qargs, block.qubits) } if _visit_target(circuit_to_dag(block), inner_wire_map): return True return False qubit_map = {qubit: index for index, qubit in enumerate(dag.qubits)} gates_out_of_basis = _visit_target(dag, qubit_map) else: for gate in dag.count_ops(recurse=True): if gate not in self._basis_gates: gates_out_of_basis = True break self.property_set["all_gates_in_basis"] = not gates_out_of_basis