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StochasticSwap

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

Bases: TransformationPass

Map a DAGCircuit onto a coupling_map adding swap gates.

Uses a randomized algorithm.

Notes

  1. Measurements may occur and be followed by swaps that result in repeated measurement of the same qubit. Near-term experiments cannot implement these circuits, so some care is required when using this mapper with experimental backend targets.
  2. We do not use the fact that the input state is zero to simplify the circuit.

StochasticSwap initializer.

The coupling map is a connected graph

If these are not satisfied, the behavior is undefined.

Parameters


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

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()

Name of the pass.

Return type

str(opens in a new tab)

run

run(dag)

Run the StochasticSwap pass on dag.

Parameters

dag (DAGCircuit) – DAG to map.

Returns

A mapped DAG.

Return type

DAGCircuit

Raises

  • TranspilerError – if the coupling map or the layout are not
  • compatible with the DAG**, or **if the coupling_map=None

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

PassManagerState

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