qiskit.transpiler.passes.CommutativeCancellation

class CommutativeCancellation(*args, **kwargs)

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

__init__()

Initialize self. See help(type(self)) for accurate signature.

Methods

__init__()	Initialize self.
name()	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)

Run the CommutativeCancellation pass on dag.

Parameters

dag (DAGCircuit) – the DAG to be optimized.

Returns

the optimized DAG.

Return type

DAGCircuit

Raises

TranspilerError – when the 1-qubit rotation gates are not found