mirror of https://github.com/Qiskit/qiskit.git
23 lines
1.5 KiB
YAML
23 lines
1.5 KiB
YAML
---
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features:
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- |
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A new pass :class:`~.DynamicalDecouplingPadding` has been added to the
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:mod:`qiskit.transpiler.passes` module. This new pass superscedes the
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existing :class:`~.DynamicalDecoupling` pass to work with the new
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scheduling workflow in the transpiler. It is a subclass of the
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:class:`~.BasePadding` pass and depends on having scheduling and alignment
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analysis passes run prior to it in a :class:`~.PassManager`.
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This new pass can take a ``pulse_alignment`` argument which represents a
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hardware constraint for waveform start timing. The spacing between gates
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comprising a dynamical decoupling sequence is now adjusted to satisfy this
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constraint so that the circuit can be executed on hardware with the constraint.
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This value is usually found in :attr:`.BackendConfiguration.timing_constraints`.
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Additionally the pass also has an ``extra_slack_distribution`` option has been
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to control how to distribute the extra slack when the duration of the
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created dynamical decoupling sequence is shorter than the idle time of your circuit
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that you want to fill with the sequence. This defaults to ``middle`` which is
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identical to conventional behavior. The new strategy ``split_edges``
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evenly divide the extra slack into the beginning and end of the sequence,
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rather than adding it to the interval in the middle of the sequence.
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This might result in better noise cancellation especially when ``pulse_alignment`` > 1.
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