Iterative procedure for computing accessible information in quantum communication

Details Iterative procedure for computing accessible information in quantum communication Iterative procedure for computing accessible information in quantum communication

2004-08-20

arxiv.org/abs/quant-ph/0408134v1

Physical Review A 71 (2005) 054303 (4 pages)

Physics

Quantum Physics

REVTeX, 4 pages, 1 figure, 1 table

Scientific paper

We present an iterative algorithm that finds the optimal measurement for extracting the accessible information in any quantum communication scenario. The maximization is achieved by a steepest-ascent approach toward the extremal point, following the gradient uphill in sufficiently small steps. We apply it to a simple ad-hoc example, as well as to a problem with a bearing on the security of a tomographic protocol for quantum key distribution.

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