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arXiv · 1102.1963

On quantum limit of optical communications: concatenated codes and joint-detection receivers

Saikat Guha·Zachary Dutton·Jeffrey H. Shapiro
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Abstract

When classical information is sent over a channel with quantum-state modulation alphabet, such as the free-space optical (FSO) channel, attaining the ultimate (Holevo) limit to channel capacity requires the receiver to make joint measurements over long codeword blocks. In recent work, we showed a receiver for a pure-state channel that can attain the ultimate capacity by applying a single-shot optical (unitary) transformation on the received codeword state followed by simultaneous (but separable) projective measurements on the single-modulation-symbol state spaces. In this paper, we study the ultimate tradeoff between photon efficiency and spectral efficiency for the FSO channel. Based on our general results for the pure-state quantum channel, we show some of the first concrete examples of codes and laboratory-realizable joint-detection optical receivers that can achieve fundamentally higher (superadditive) channel capacity than receivers that physically detect each modulation symbol one at a time, as is done by all conventional (coherent or direct-detection) optical receivers.

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Saikat Guha, Zachary Dutton, Jeffrey H. Shapiro. 2011-02-09. On quantum limit of optical communications: concatenated codes and joint-detection receivers. https://doi.org/10.1109/isit.2011.6034073

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