Fix post-oxidization change in ConsolidateBlocks behavior (backport #13450)
#13453
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* Set decomposer to None if kak_gates not found during ConsolidateBlocks initialization. * Add test that reproduces issue * Re-add rzz to list of kak gates * Add path for rzx gate. (cherry picked from commit 94cea41)
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ElePT
approved these changes
Nov 19, 2024
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Summary
Fixes the behavioral difference introduced by #13368 that caused #13438.
The original implementation of the pass used to set the
ConsolidateBlocksinternal decomposer callingunitary_synthesis._decomposer_2q_from_basis_gates, which, whenkak_basiswasn't found, would returnNone. During the oxidization efforts,unitary_synthesis._decomposer_2q_from_basis_gateswas replaced with inline code that didn't contemplate this path (always set a default decomposer), which in the reproducing example lead to a longer output circuit (the gates were collected into a unitary block and then decomposed differently).Details and comments
Technically not a bugfix because the change wasn't released yet.
Using the example shown in the issue ->
ConsolidateBlocksoutput dag with 1.2.4:ConsolidateBlocksoutput dag with 1.3.0rc1:ConsolidateBlocksoutput dag after this fix:This is an automatic backport of pull request #13450 done by [Mergify](https://mergify.com).