Quantum-optical communication rates through an amplifying random medium

Details Quantum-optical communication rates through an amplifying random medium Quantum-optical communication rates through an amplifying random medium

2002-03-19

arxiv.org/abs/quant-ph/0203094v1

Phys.Rev.Lett. 89, 043902 (2002)

Physics

Quantum Physics

4 pages, 4 Postscript figures

Scientific paper

10.1103/PhysRevLett.89.043902

We study the competing effects of stimulated and spontaneous emission on the information capacity of an amplifying disordered waveguide. At the laser threshold the capacity reaches a "universal" limit, independent of the degree of disorder. Whether or not this limit is larger or smaller than the capacity without amplification depends on the disorder, as well as on the input power. Explicit expressions are obtained for heterodyne detection of coherent states, and generalized for arbitrary detection scheme.

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