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remove_barriers.py
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/
remove_barriers.py
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# This code is part of Qiskit.
#
# (C) Copyright IBM 2017, 2021.
#
# 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.
"""Remove all barriers in a circuit"""
from qiskit.dagcircuit import DAGCircuit
from qiskit.transpiler.basepasses import TransformationPass
from qiskit.transpiler.passes.utils import control_flow
class RemoveBarriers(TransformationPass):
"""Return a circuit with any barrier removed.
This transformation is not semantics preserving.
Example:
.. plot::
:include-source:
from qiskit import QuantumCircuit
from qiskit.transpiler.passes import RemoveBarriers
circuit = QuantumCircuit(1)
circuit.x(0)
circuit.barrier()
circuit.h(0)
circuit = RemoveBarriers()(circuit)
circuit.draw('mpl')
"""
@control_flow.trivial_recurse
def run(self, dag: DAGCircuit) -> DAGCircuit:
"""Run the RemoveBarriers pass on `dag`."""
dag.remove_all_ops_named("barrier")
return dag