Capacity of optical communication in loss and noise with general quantum Gaussian receivers

Masahiro Takeoka, Saikat Guha

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Laser-light (coherent-state) modulation is sufficient to achieve the ultimate (Holevo) capacity of classical communication over a lossy and noisy optical channel, but requires a receiver that jointly detects long modulated codewords with highly nonlinear quantum operations, which are near-impossible to realize using current technology. We analyze the capacity of the lossy-noisy optical channel when the transmitter uses coherent state modulation but the receiver is restricted to a general quantum-limited Gaussian receiver, i.e., one that may involve arbitrary combinations of Gaussian operations (passive linear optics: beamsplitters and phase-shifters, second order nonlinear process (squeezers), along with homodyne or heterodyne detection measurements) and any amount of classical feedforward within the receiver. Under these assumptions, we show that the Gaussian receiver that attains the maximum mutual information is either homodyne detection, heterodyne detection, or time sharing between the two, depending upon the received power level. In other words, our result shows that to exceed the theoretical limit of conventional coherent optical communications, one has to incorporate non-Gaussian (i.e. higher order nonlinear) operations in the receiver.

本文言語English
ホスト出版物のタイトル2014 IEEE International Symposium on Information Theory, ISIT 2014
出版社Institute of Electrical and Electronics Engineers Inc.
ページ2799-2803
ページ数5
ISBN(印刷版)9781479951864
DOI
出版ステータスPublished - 2014
外部発表はい
イベント2014 IEEE International Symposium on Information Theory, ISIT 2014 - Honolulu, HI, United States
継続期間: 2014 6 292014 7 4

出版物シリーズ

名前IEEE International Symposium on Information Theory - Proceedings
ISSN(印刷版)2157-8095

Conference

Conference2014 IEEE International Symposium on Information Theory, ISIT 2014
国/地域United States
CityHonolulu, HI
Period14/6/2914/7/4

ASJC Scopus subject areas

  • 理論的コンピュータサイエンス
  • 情報システム
  • モデリングとシミュレーション
  • 応用数学

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