Quantum-optical communication rates through an amplifying random medium

Abstract

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.

4 pages, 4 Postscript figures

References in corpus (4)

• Communication through a Diffusive Medium: Coherence and Capacity
• Thermal radiation and amplified spontaneous emission from a random medium
• Excess noise for coherent radiation propagating through amplifying random media
• Optimized quantum-optical communications in the presence of loss

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• Transport of quantum noise through random media
• Scattering of entangled two-photon states
• Continuous-wave spatial quantum correlations of light induced by multiple scattering
• Eigenfunction statistics of Laguerre Brownian ensemble
• Angular-resolved photon-coincidence measurements in a multiple-scattering medium
• Statistical distribution of quantum correlation induced by multiple scattering in the disordered medium
• Modulating quantum fluctuations of scattered lights in disordered media via wavefront shaping
• Excess-noise suppression for a squeezed state propagating through random amplifying media via wave-front shaping