Demonstration of Near-Optimal Discrimination of Optical Coherent States

Christoffer Wittmann, Masahiro Takeoka, Katiúscia N. Cassemiro, Masahide Sasaki, Gerd Leuchs, and Ulrik L. Andersen
Phys. Rev. Lett. 101, 210501 – Published 17 November 2008

Abstract

The optimal discrimination of nonorthogonal quantum states with minimum error probability is a fundamental task in quantum measurement theory as well as an important primitive in optical communication. In this work, we propose and experimentally realize a new and simple quantum measurement strategy capable of discriminating two coherent states with smaller error probabilities than can be obtained using the standard measurement devices: the Kennedy receiver and the homodyne receiver.

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  • Received 21 January 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.210501

©2008 American Physical Society

Authors & Affiliations

Christoffer Wittmann1, Masahiro Takeoka2,3, Katiúscia N. Cassemiro4, Masahide Sasaki2,3, Gerd Leuchs1, and Ulrik L. Andersen5,1

  • 1Institut für Optik, Information und Photonik, Max-Planck-Forschungsgruppe, Universität Erlangen-Nürnberg, Günther-Scharowsky-Straße 1, 91058, Erlangen, Germany
  • 2National Institute of Information and Communications Technology, 4-2-1 Nukui-kitamachi, Koganei, Tokyo 184-8795, Japan
  • 3CREST, Japan Science and Technology Agency, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
  • 4Instituto de Fìsica, Universidade de São Paulo, São Paulo, SP, Brazil, 05315-970
  • 5Department of Physics, Technical University of Denmark, Building 309, 2800 Kongens Lyngby, Denmark

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Issue

Vol. 101, Iss. 21 — 21 November 2008

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