Unroll3qOrMore

class qiskit.transpiler.passes.Unroll3qOrMore(*args, **kwargs)[source]

Bases: TransformationPass

Recursively expands 3q+ gates until the circuit only contains 2q or 1q gates.

Initialize the Unroll3qOrMore pass

Parameters:

  • target (Target) – The target object representing the compilation target. If specified any multi-qubit instructions in the circuit when the pass is run that are supported by the target device will be left in place. If both this and basis_gates are specified only the target will be checked.

  • basis_gates (list) – A list of basis gate names that the target device supports. If specified any gate names in the circuit which are present in this list will not be unrolled. If both this and target are specified only the target will be used for checking which gates are supported.

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(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()

Name of the pass.

Return type:

str

run(dag)[source]

Run the Unroll3qOrMore pass on dag.

Parameters:

dag (DAGCircuit) – input dag

Returns:

output dag with maximum node degrees of 2

Return type:

DAGCircuit

Raises:

QiskitError – if a 3q+ gate is not decomposable

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