# ALAPSchedule¶

class ALAPSchedule(*args, **kwargs)[source]

Bases: qiskit.transpiler.basepasses.TransformationPass

ALAP Scheduling pass, which schedules the stop time of instructions as late as possible.

For circuits with instructions writing or reading clbits (e.g. measurements, conditional gates), the scheduler assumes clbits I/O operations take no time, measure locks clbits to be written at its end and c_if locks clbits to be read at its beginning.

Notes

The ALAP scheduler may not schedule a circuit exactly the same as any real backend does when the circuit contains control flows (e.g. conditional instructions).

ALAPSchedule initializer.

Parameters

durations (InstructionDurations) – Durations of instructions to be used in scheduling

Methods

 name Return the name of the pass. run Run the ALAPSchedule pass on dag.

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).