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Ultimate Capacity of a Linear Time-Invariant Bosonic Channel

We determine the ultimate classical information capacity of a linear time-invariant bosonic channel with additive phase-insensitive Gaussian noise. This channel can model fiber-optic communication at power levels below the threshold for significant nonlinear effects. We provide a general continuous-time result that gives the ultimate capacity for such a channel operating in the quasimonochromatic regime under an average power constraint. This ultimate capacity is compared with corresponding results for heterodyne and homodyne detection over the same channel.

preprint2016arXivOpen access
Bhaskar Roy BardhanJeffrey H. Shapiro
quant-ph
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Bhaskar Roy BardhanJeffrey H. Shapiro

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