fix issue/12311 with fractional gate in basis (backport #12511) #12813
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* linting * linting...relax check for 3-qubit circuit * update test docstrings * black update * bind RZZ to pi/2 if Rzz(theta) in basis * Apply suggestions from code review --------- Co-authored-by: Matthew Treinish <mtreinish@kortar.org> (cherry picked from commit aaaf107)
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Summary
This fixes an issue where an exception would be raised if transpiling a unitary gate to a backend with an RZZGate in its basis however transpiling with only
basis_gatesspecified would transpile fine.fixes #12311
Details and comments
In this case, where RZZ is the only entangling gate in the basis, decomposition of a 2q unitary gate wouldn't get synthesized in the
UnitarySynthesispass but would instead be synthesized in theHighLevelSynthesispass because this would call the instruction's_definemethod which callstwo_qubit_cnot_decompose. A subsequentBasisTranslatorpass ultimately maps the cx to the rzz basis. I'm not sure whether this indirect path to unitary synthesis is intentional.This pr resolves the specific example posed in the issue.
This is an automatic backport of pull request #12511 done by [Mergify](https://mergify.com).