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Fix BarrierBeforeFinalMeasurements with loose bits #8924

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merged 3 commits into from
Oct 18, 2022

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Summary

We simply need to consider loose bits as well when constructing the new DAG layer. This isn't DAGCircuit.copy_empty_like because we don't want things like metadata and global phase.

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Fix #8923.

We simply need to consider loose bits as well when constructing the new
DAG layer.  This isn't `DAGCircuit.copy_empty_like` because we don't
want things like metadata and global phase.
@jakelishman jakelishman added stable backport potential The bug might be minimal and/or import enough to be port to stable Changelog: Bugfix Include in the "Fixed" section of the changelog labels Oct 17, 2022
@jakelishman jakelishman requested a review from a team as a code owner October 17, 2022 15:44
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coveralls commented Oct 17, 2022

Pull Request Test Coverage Report for Build 3269945879

  • 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
  • 26 unchanged lines in 2 files lost coverage.
  • Overall coverage decreased (-0.03%) to 84.726%

Files with Coverage Reduction New Missed Lines %
src/results/marginalization.rs 12 81.61%
src/sampled_exp_val.rs 14 63.93%
Totals Coverage Status
Change from base Build 3269945696: -0.03%
Covered Lines: 61910
Relevant Lines: 73071

💛 - Coveralls

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LGTM, we basically had the same exact fix for DenseLayout in #8843. I'm sure this isn't the last of the bugs we'll hit in old transpiler passes that don't get run regularly around loose bits.

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@Mergifyio requeue

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mergify bot commented Oct 17, 2022

requeue

✅ The queue state of this pull request has been cleaned. It can be re-embarked automatically

@mergify mergify bot merged commit 64c5eb6 into Qiskit:main Oct 18, 2022
mergify bot pushed a commit that referenced this pull request Oct 18, 2022
We simply need to consider loose bits as well when constructing the new
DAG layer.  This isn't `DAGCircuit.copy_empty_like` because we don't
want things like metadata and global phase.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
(cherry picked from commit 64c5eb6)
ajavadia pushed a commit to ajavadia/qiskit that referenced this pull request Oct 18, 2022
We simply need to consider loose bits as well when constructing the new
DAG layer.  This isn't `DAGCircuit.copy_empty_like` because we don't
want things like metadata and global phase.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
mergify bot added a commit that referenced this pull request Oct 18, 2022
We simply need to consider loose bits as well when constructing the new
DAG layer.  This isn't `DAGCircuit.copy_empty_like` because we don't
want things like metadata and global phase.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
(cherry picked from commit 64c5eb6)

Co-authored-by: Jake Lishman <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
@jakelishman jakelishman deleted the fix-final-barrier-loose-clbits branch October 19, 2022 10:00
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BarrierBeforeFinalMeasurements fails if there are loose qubits or clbits
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