T2Hahn/T1/RamseyXY/T2Ramsey create delay lengths not supported by the backend #881
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wshanks
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Aug 11, 2022
This was a workaround for IBM backends that did not report their timing constraints. All backends now report timing constraints so the adjustment is no longer needed and as implemented is causing problems (qiskit-community#881). The scheduling_method adjustment is also removed because it should not be necessary.
This was referenced Aug 11, 2022
wshanks
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Aug 12, 2022
This was a workaround for IBM backends that did not report their timing constraints. All backends now report timing constraints so the adjustment is no longer needed and as implemented is causing problems (qiskit-community#881).
wshanks
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Aug 16, 2022
This was a workaround for IBM backends that did not report their timing constraints. All backends now report timing constraints so the adjustment is no longer needed and as implemented is causing problems (#881).
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Closed by #881. |
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Informations
What is the current behavior?
The experiments listed in the title create delay lengths not supported by the backend. For IBM backends, this can produce an error like
Error message: Delays must be a multiple of 16 samples. Error code: 8043..Steps to reproduce the problem
Run one of the experiments listed in the title on a backend with
pulse_alignment > 1inbackend.configuration().timing_constraints.What is the expected behavior?
The experiment runs without an error from the backend.
Suggested solutions
The problem is that these experiments overwrite the
timing_constraintstranspile option entirely, rather than just setting values within it and leaving others with their default values from the backend. This prevents the transpiler pass that adjust delay timings from knowing all of the timing constraints to use when adjusting delay values. The solution is to make sure all of the default values from the backend are preserved.The text was updated successfully, but these errors were encountered: