Optimize1qGatesDecomposition
class qiskit.transpiler.passes.Optimize1qGatesDecomposition(*args, **kwargs)
Bases: TransformationPass
Optimize chains of single-qubit gates by combining them into a single gate.
The decision to replace the original chain with a new re-synthesis depends on:
- whether the original chain was out of basis: replace
- whether the original chain was in basis but re-synthesis is lower error: replace
- whether the original chain contains a pulse gate: do not replace
- whether the original chain amounts to identity: replace with null
Error is computed as a multiplication of the errors of individual gates on that qubit.
Optimize1qGatesDecomposition initializer.
Parameters
- basis (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 parameter and the Euler basis. Ignored if
targetis also specified. - target (Optional[Target]) – The
Targetobject corresponding to the compilation target. When specified, any argument specified forbasis_gatesis 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
execute
execute(passmanager_ir, state, callback=None)
Execute optimization task for input Qiskit IR.
Parameters
- passmanager_ir (Any) – Qiskit IR to optimize.
- state (PassManagerState) – State associated with workflow execution by the pass manager itself.
- callback (Callable | None) – A callback function which is caller per execution of optimization task.
Returns
Optimized Qiskit IR and state of the workflow.
Return type
tuple[Any, qiskit.passmanager.compilation_status.PassManagerState]
name
run
run(dag)
Run the Optimize1qGatesDecomposition pass on dag.
Parameters
dag (DAGCircuit) – the DAG to be optimized.
Returns
the optimized DAG.
Return type
update_status
update_status(state, run_state)
Update workflow status.
Parameters
- state (PassManagerState) – Pass manager state to update.
- run_state (RunState) – Completion status of current task.
Returns
Updated pass manager state.
Return type