Interference of Quantum Channels

Details Interference of Quantum Channels Interference of Quantum Channels

2003-03-31

arxiv.org/abs/quant-ph/0303178v2

Physics

Quantum Physics

4 pages, 5 figures, REVTeX 4, typographical corrections and added acknowledgement

Scientific paper

10.1103/PhysRevLett.91.067902

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

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