Qiskit / qiskit / 16796677154

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Commit Message

Adjust pulse optimal cx two qubit decomposer to avoid RZ(0) (#14629)

* Adjust pulse optimal cx two qubit decomposer to avoid RZ(0)

In the TwoQubitBasisDecomposer there was a special code path to do pulse
optimal decomposition. This code path could occasionally result in a 0
degree angle rz gate being emitted. This would mean the sequence of SX -
RZ(0) - SX would be generated which is just an X gate. This commit
updates the decomposition to just use an X gate in these cases if
they're encountered. This is essentially the same optimization that was
done in #5937/#5827 for the single qubit euler decomposer but this
applies it to the pulse optimal 2q decomposition.

* Add tests

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5 existing lines in 3 files now uncovered.

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