NoiseAdaptiveLayout
class qiskit.transpiler.passes.NoiseAdaptiveLayout(*args, **kwargs)
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.
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
Targetis provided inbackend_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
- 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
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