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Interference of quantum channels

Oi, Daniel K.L. (2003) Interference of quantum channels. Physical Review Letters, 91 (6). ISSN 0031-9007

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We show how interferometry can be used to characterize certain aspects of general quantum processes and, in particular, the coherence of completely positive maps. We derive a measure of coherent fidelity, the maximum interference visibility, and the closest unitary operator to a given physical process under this measure.