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Ran 15 Jul 2025 10:29AM UTC

Files 830

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Committed 15 Jul 2025 09:58AM UTC coverage: 87.766% (+0.01%) from 87.755%

Job # 16290161870.1

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push

github

Committed by

web-flow

Commit Message

Fix non-determinism VF2Layout with only 1q gates (#14730)

This commit fixes an issue in the VF2Layout transpiler pass that would
cause a non-deterministic output if the circuit had any qubit that only
had single qubit operations. The dedicated internal function to deal with
this special case sorts the qubits in the circuit by number of operations
and the physical qubits on the target by error rate, to map the qubits
with the lowest error rate. However this sorting wasn't fully stable as
it was done on a hash set which doesn't have a stable iteration order.
This commit fixes this by also sorting based on the qubit index so in
the case of a tie the sort is stable.

Fixes #14729

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