Quantum physics in optical communication systems

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Abstract

Conventional systems use coherent-state (CS) signals, which are like classical signals with intrinsic amplitude fluctuations. The input (CS) and output (after transmission through a sequence of amplifiers and attenuators) fluctuations have Gaussian statistics. The SC model (half-photon per mode of Gaussian fluctuations) predicts the quadrature and number fluctuations (variances and correlations) accurately. Standard links use 2-mode PI amplifiers (linear devices). Systems with 1-mode PS amplifiers have lower information capacities! Systems with 2-mode PS amplifiers could have higher capacities (4 b/s-Hz). Fiber nonlinearities reduce the link capacities (by increasing fluctuations). Transmission of individual and entangled states? © 2011 Optical Society of America.

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Mckinstrie, C. J. (2011). Quantum physics in optical communication systems. In 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2011. IEEE Computer Society. https://doi.org/10.1364/ofc.2011.owx1

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