qiskit/releasenotes/notes/2.0/fixes_13858-2dacfc0431c1a6e...

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upgrade_synthesis:
- |
The ``atomic_evolution`` argument to :class:`.ProductFormula` (and its
subclasses :class:`.QDrift`, :class:`.LieTrotter` and :class:`SuzukiTrotter` )
has a new function signature. Rather than taking some Pauli
operator and time coefficient and returning the evolution circuit, the new
function takes in an existing circuit and should append the evolution of the
provided Pauli and given time to this circuit. This new implementation
benefits from significantly better performance.