Information capacity formula of quantum optical channels

Details Information capacity formula of quantum optical channels Information capacity formula of quantum optical channels

2001-05-10

arxiv.org/abs/quant-ph/0105042v1

Physics

Quantum Physics

20 pages, 3 figures

Scientific paper

The applications of the general formulae of channel capacity developed in the quantum information theory to evaluation of information transmission capacity of optical channel are interesting subjects. In this review paper, we will point out that the formulation based on only classical-quantum channel mapping model may be inadequate when one takes into account a power constraint for noisy channel. To define the power constraint well, we should explicitly consider how quantum states are conveyed through a transmission channel. Basing on such consideration, we calculate a capacity formula for an attenuated noisy optical channel with genreral Gaussian state input; this gives certain progress beyond the example in our former paper.

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