TimeUnitConversion
class qiskit.transpiler.passes.TimeUnitConversion(*args, **kwargs)
Bases: TransformationPass
Choose a time unit to be used in the following time-aware passes, and make all circuit time units consistent with that.
This pass will add a Instruction.duration metadata to each op whose duration is known which will be used by subsequent scheduling passes for scheduling.
If dt (in seconds) is known to transpiler, the unit 'dt' is chosen. Otherwise, the unit to be selected depends on what units are used in delays and instruction durations:
's': if they are all in SI units.'dt': if they are all in the unit'dt'.- raise error: if they are a mix of SI units and
'dt'.
TimeUnitAnalysis initializer.
Parameters
- inst_durations (InstructionDurations) – A dictionary of durations of instructions.
- target – The
Targetrepresenting the target backend, if bothinst_durationsandtargetare specified then this argument will take precedence andinst_durationswill be ignored.
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 TimeUnitAnalysis pass on dag.
Parameters
dag (DAGCircuit) – DAG to be checked.
Returns
DAG with consistent timing and op nodes annotated with duration.
Return type
Raises
TranspilerError – if the units are not unifiable
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