qiskit/releasenotes/notes/0.45/unitary-overlap-7dde87a8e2d...

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Added the :class:`.UnitaryOverlap` circuit to the Qiskit circuit library that
can be used to compute the fidelity of states generated by unitaries
by looking at the probability of the output distribution in the all-zeros
state or, equivalently, by computing the expectation value of the projector
onto the all-zeros state. This is useful in applications such as machine
learning, and computing excited states in quantum chemistry, to name a few.