Fix #7006 by tracking availability of clbits in scheduling #7085
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kdk
reviewed
Oct 7, 2021
kdk
reviewed
Oct 14, 2021
kdk
previously approved these changes
Oct 14, 2021
kdk
approved these changes
Oct 19, 2021
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Summary
Fix #7006 by tracking availability of clbits in scheduling passes
Details and comments
Previously, scheduling of circuits using clbits was not correct because availability of clbits was not considered in scheduling passes. This PR updates scheduling passes (ASAP, ALAP, AlignMeasures) so that they take clbits availability into accounts, assuming a simple I/O model where
measurelocks clbits to be written at its end andc_iflocks clbits to be read at its beginning. It also assumes zero time for creg I/O operations since current backends do not report I/O latencies (how much time it takes for such an I/O operation on clbits).