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.
CITATION STYLE
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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