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Ran 19 May 2026 10:59AM UTC

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Committed 19 May 2026 10:00AM UTC coverage: 87.687% (-0.01%) from 87.697%

Job # 26091433602.1

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github

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web-flow

Commit Message

Fix `InverseCancellation` for symmetric pairs (#16153)

* Fix `InverseCancellation` for symmetric pairs.

Symmetric gates should get cancelled irrespective of the qubit order. This did not happen in InverseCancellation, which didn't consistently cancel CS and CSdg gates in the default setup since their qubit argument were out of order. Coincidentally _it did_ cancel these gates in a specific order as a by product since the boolean logic was not grouped correctly, as reported in #15855. This commit fixes this behavior.

This commit does not more generally enable handling of symmetric, user-supplied gates.

* Better inverse pair structure

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

* More precise wording in reno

---------

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

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