qiskit/releasenotes/notes/update-cs-csdg-in-equivalen...

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features_synthesis:
- |
The standard equivalence library has additional equivalences for :class:`.CSGate` and :class:`.CSdgGate`.
When transpiling to the `["cx", "u"]` basis set, the :class:`.BasisTranslator` transpiler pass now uses
2 :class:`.CXGate` gates instead of 3 for :class:`.CSdgGate`, and in addition reduces the number of single-qubit
gates in both cases.