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arxiv: quant-ph/0303178 · v2 · submitted 2003-03-31 · 🪐 quant-ph

Interference of Quantum Channels

classification 🪐 quant-ph
keywords interferencemeasurequantumaspectscertainchannelscharacteriseclosest
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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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