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ApplyLayout

qiskit.transpiler.passes.ApplyLayout(*args, **kwargs) GitHub(opens in a new tab)

Bases: TransformationPass

Transform a circuit with virtual qubits into a circuit with physical qubits.

Transforms a DAGCircuit with virtual qubits into a DAGCircuit with physical qubits by applying the Layout given in property_set. Requires either of passes to set/select Layout, e.g. SetLayout, TrivialLayout. Assumes the Layout has full physical qubits.

If a post layout pass is run and sets the post_layout property set field with a new layout to use after ApplyLayout has already run once this pass will compact the layouts so that we apply original_virtual -> existing_layout -> new_layout -> new_physical so that the output circuit and layout combination become: original_virtual -> new_physical


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) GitHub(opens in a new tab)

Execute optimization task for input Qiskit IR.

Parameters

Returns

Optimized Qiskit IR and state of the workflow.

Return type

tuple(opens in a new tab)[Any(opens in a new tab), qiskit.passmanager.compilation_status.PassManagerState]

name

name() GitHub(opens in a new tab)

Name of the pass.

Return type

str(opens in a new tab)

run

run(dag) GitHub(opens in a new tab)

Run the ApplyLayout pass on dag.

Parameters

dag (DAGCircuit) – DAG to map.

Returns

A mapped DAG (with physical qubits).

Return type

DAGCircuit

Raises

TranspilerError – if no layout is found in property_set or no full physical qubits.

update_status

update_status(state, run_state) GitHub(opens in a new tab)

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

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