Displacement receiver for phase-shift-keyed coherent states

Shuro Izumi, Masahiro Takeoka, Mikio Fujiwara, Nicola Dalla Pozza, Antonio Assalini, Kazuhiro Ema, and Masahide Sasaki
Phys. Rev. A 86, 042328 – Published 22 October 2012

Abstract

The quantum receiver is an important tool for overcoming the standard quantum limit (SQL) of discrimination errors in optical communication. We theoretically study the quantum receivers for discriminating ternary and quaternary phase-shift-keying coherent states in terms of average error rate and mutual information. Our receiver consists of on-off–type photon detectors and displacement operations without electrical feedforward operations. We show that for the ternary signals, the receiver shows a reasonable gain from the SQL even without feedforward. This scheme is realizable with the currently available technology. For the quaternary signals feedforward operation is crucial to overcome the SQL with imperfect devices. We also analytically examine the asymptotic limit of the performance of the proposed receiver with respect to the number of feedforward steps.

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  • Received 9 August 2012

DOI:https://doi.org/10.1103/PhysRevA.86.042328

©2012 American Physical Society

Authors & Affiliations

Shuro Izumi1,2, Masahiro Takeoka1, Mikio Fujiwara1, Nicola Dalla Pozza3, Antonio Assalini3, Kazuhiro Ema2, and Masahide Sasaki1

  • 1National Institute of Information and Communications Technology, 4-2-1 Nukui-kita, Koganei, Tokyo 184-8795, Japan
  • 2Sophia University, 7-1 Kioicho, Chiyoda-ku, Tokyo 102-8554, Japan
  • 3Department of Information Engineering, University of Padua, Via Gradenigo 6/B, 35131 Padova, Italy

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Vol. 86, Iss. 4 — October 2012

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