qiskit/releasenotes/notes/0.18/ZSXX-decomposition-90fead72...

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---
features:
- |
The decomposition methods for single-qubit gates, specified via the
``basis`` kwarg, in
:class:`~qiskit.quantum_info.OneQubitEulerDecomposer` has been expanded to
now also include the ``'ZSXX'`` basis, for making use of direct
:math:`X` gate as well as :math:`\sqrt{X}` gate.
fixes:
- |
The :class:`~qiskit.quantum_info.OneQubitEulerDecomposer` and
:class:`~qiskit.quantum_info.TwoQubitBasisDecomposer` classes for
one and two qubit gate synthesis have been improved to tighten up
tolerances, improved repeatability and simplification, and fix
several global-phase-tracking bugs.