qiskit/releasenotes/notes/0.25/fix-1q-matrix-bug-in-quantu...

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---
fixes:
- |
When :func:`~qiskit.quantum_info.synthesis.qs_decomposition`, which does quantum Shannon
decomposition, was called on trivial numeric unitaries that do not benefit from this
decomposition, an unexpected error was raised. With this fix, such unitaries are detected and
the equivalent circuit is returned without performing Shannon decomposition.