CommutativeCancellation#

class qiskit.transpiler.passes.CommutativeCancellation(*args, **kwargs)[source]#

Bases: TransformationPass

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.
target (Target) -- The Target representing the target backend, if both basis_gates and this are specified then this argument will take precedence and basis_gates will be ignored.

Attributes

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.

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).

Methods

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