ConvertToMidCircuitMeasure

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

Bases: TransformationPass

This pass replaces terminal measures in the middle of the circuit with MidCircuitMeasure instructions.

Transpiler pass that replaces terminal measure instructions in non-terminal locations with MidCircuitMeasure instructions. By default, these will be measure_2, but the pass accepts custom measure_ definitions. This pass is expected to run after routing, as it will check that MidCircuitMeasure is supported in the corresponding physical qubit.

Note that the pass will only act on non-terminal Measure instances, and won’t replace existing mid-circuit measurement instructions (e.g., "measure_2" -> "measure_3") or convert any MidCircuitMeasure instance into a Measure.

Parameters:

  • target – Backend’s target instance that contains one or more measure_ instructions.

  • mcm_name – Name of the measure_ instruction that terminal measure instructions in non-terminal locations will be replaced with. This instruction must be contained in the target. Defaults to measure_2.

Raises:

ValueError – If the specifcied mcm_name does not conform to the measure_ pattern or is not contained in the provided target.

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

__call__(circuit, property_set=None)

Runs the pass on circuit.

Parameters:

  • circuit (QuantumCircuit) – The dag on which the pass is run.

  • property_set (PropertySet | dict | None) – Input/output property set. An analysis pass might change the property set in-place. If not given, the existing property_set attribute of the pass will be used (if set).

Returns:

If on transformation pass, the resulting QuantumCircuit. If analysis pass, the input circuit.

Return type:

QuantumCircuit

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, PassManagerState]

name()

Name of the pass.

Return type:

str

run(dag)[source]

Run the pass on a dag.

Parameters:

dag (DAGCircuit)

Return type:

DAGCircuit

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:

PassManagerState