On quantum limit of optical communications: Concatenated codes and joint-detection receivers
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Shapiro_On quantum limit.pdf
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2.43 MB
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Author(s)
Guha, Saikat
Dutton, Zachary
Shapiro, Jeffrey H.
Date Issued
October 2011
Journal
Proceedings on the IEEE International Symposium on Information Theory Proceedings (ISIT), 2011
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Guha, Saikat, Zachary Dutton, and Jeffrey H. Shapiro. “On Quantum Limit of Optical Communications: Concatenated Codes and Joint-detection Receivers.” IEEE International Symposium on Information Theory Proceedings (ISIT), 2011. 274–278.
Version
Author's final manuscript
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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1109/ISIT.2011.6034073
