Qiskit / qiskit / 8624253528

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Commit Message

Reduce number of decomposers used during UnitarySynthesis default plugin (#12151)

* Reduce number of decomposers used during UnitarySynthesis default plugin

This commit reduces the number of decomposers we run in the default
synthesis plugin when we're in known targets. Previously the unitary
synthesis plugin was trying to product of all 1q basis and 2q basis for
every 2q pair that is being synthesized. This would result in duplicated
work for several 1q bases where there were potential subsets available
as two different target euler bases, mainly U321 and U3 or ZSX and ZSXX
if the basis gates for a qubit where U3, U2, U1 or Rz, SX, and X
respectively. This reuses the logic from Optimize1qGatesDecomposition to
make the euler basis selection which does the deduplication. Similarly,
in the presence of known 2q gates we can skip the XXDecomposer checks (or
potentially running the XXDecomposer) which should speed up both the
selection of decomposers and also reduce the number of decomposers we
run.

* Update qiskit/transpiler/passes/synthesis/unitary_synthesis.py

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Co-authored-by: John Lapeyre <jlapeyre@users.noreply.github.com>

Run Details

8 of 8 new or added lines in 1 file covered. (100.0%)

15 existing lines in 4 files now uncovered.

60302 of 67464 relevant lines covered (89.38%)

232048.4 hits per line