# qiskit.transpiler.passes.CommutativeCancellation¶

class CommutativeCancellation(*args, **kwargs)[source]

Cancel the redundant (self-adjoint) gates through commutation relations.

Pass for cancelling self-inverse gates/rotations. The cancellation utilizes the commutation relations in the circuit. Gates considered include:

H, X, Y, Z, CX, CY, CZ


CommutativeCancellation initializer.

Parameters

basis_gates (list[str]) – Basis gates to consider, e.g. ['u3', 'cx']. For the effects of this pass, the basis is the set intersection between the basis_gates parameter and the gates in the dag.

__init__(basis_gates=None)[source]

CommutativeCancellation initializer.

Parameters

basis_gates (list[str]) – Basis gates to consider, e.g. ['u3', 'cx']. For the effects of this pass, the basis is the set intersection between the basis_gates parameter and the gates in the dag.

Methods

 __init__([basis_gates]) CommutativeCancellation initializer. Return the name of the pass. run(dag) Run the CommutativeCancellation pass on dag.

Attributes

 is_analysis_pass Check if the pass is an analysis pass. is_transformation_pass Check if the pass is a transformation pass.
property is_analysis_pass

Check if the pass is an analysis pass.

If the pass is an AnalysisPass, that means that the pass can analyze the DAG and write the results of that analysis in the property set. Modifications on the DAG are not allowed by this kind of pass.

property is_transformation_pass

Check if the pass is a transformation pass.

If the pass is a TransformationPass, that means that the pass can manipulate the DAG, but cannot modify the property set (but it can be read).

name()

Return the name of the pass.

run(dag)[source]

Run the CommutativeCancellation pass on dag.

Parameters

dag (DAGCircuit) – the DAG to be optimized.

Returns

the optimized DAG.

Return type

DAGCircuit

Raises