qiskit/releasenotes/notes/2.0/fix-pauli-evo-all-identity-...

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---
fixes:
- |
The :class:`.PauliEvolutionGate`, if used with a product formula synthesis (this is the default),
did not correctly handle all-identity terms in the operator. The all-identity term
should introduce a global phase equal to ``-evolution_time``, but was off by a factor of 2
and could break for parameterized times. This behavior is now fixed.
Fixed `#13625 <https://github.com/Qiskit/qiskit/issues/13625>`__.