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NoiseAdaptiveLayout

qiskit.transpiler.passes.NoiseAdaptiveLayout(*args, **kwargs)

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Bases: AnalysisPass

Choose a noise-adaptive Layout based on current calibration data for the backend.

This pass associates a physical qubit (int) to each virtual qubit of the circuit (Qubit), using calibration data.

The pass implements the qubit mapping method from: Noise-Adaptive Compiler Mappings for Noisy Intermediate-Scale Quantum Computers Prakash Murali, Jonathan M. Baker, Ali Javadi-Abhari, Frederic T. Chong, Margaret R. Martonosi ASPLOS 2019 (arXiv:1901.11054).

Ordering of edges

Map qubits edge-by-edge in the order of decreasing frequency of occurrence in the program dag.

Initialization

Initialization()

If an edge exists with both endpoints unmapped,

pick the best available hardware cx to execute this edge.

Iterative step

When an edge exists with one endpoint unmapped,

map that endpoint to a location which allows

maximum reliability for CNOTs with previously mapped qubits.

In the end if there are unmapped qubits (which don't

participate in any CNOT), map them to any available

hardware qubit.

Notes

Notes()

even though a layout is not strictly a property of the DAG, in the transpiler architecture it is best passed around between passes by being set in property_set.

NoiseAdaptiveLayout initializer.

Deprecated since version 0.46

The class qiskit.transpiler.passes.layout.noise_adaptive_layout.NoiseAdaptiveLayout is deprecated as of qiskit 0.46. It will be removed in the 1.0.0 release.

Parameters

  • backend_prop (Union[BackendProperties, Target]) – backend properties object
  • coupling_map (CouplingMap) – Optional. To filter the backend_prop qubits/gates. This parameter is ignored if Target is provided in backend_prop. That method is preferred.

Raises

TranspilerError – if invalid options


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 NoiseAdaptiveLayout pass on dag.

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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