Interference of Quantum Channels
Quantum Physics
2009-11-10 v2
Abstract
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.
Cite
@article{arxiv.quant-ph/0303178,
title = {Interference of Quantum Channels},
author = {Daniel K. L. Oi},
journal= {arXiv preprint arXiv:quant-ph/0303178},
year = {2009}
}
Comments
4 pages, 5 figures, REVTeX 4, typographical corrections and added acknowledgement