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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 6 — Jun. 1, 2010
  • pp: A137–A145

Quantum repeaters with entangled coherent states

Nicolas Sangouard, Christoph Simon, Nicolas Gisin, Julien Laurat, Rosa Tualle-Brouri, and Philippe Grangier  »View Author Affiliations


JOSA B, Vol. 27, Issue 6, pp. A137-A145 (2010)
http://dx.doi.org/10.1364/JOSAB.27.00A137


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Abstract

Entangled coherent states can be prepared remotely by subtracting nonlocally a single photon from two quantum superpositions of coherent states, the so-called “Schrödinger’s cat” state. Such entanglement can further be distributed over longer distances by successive entanglement swapping operations using linear optics and photon-number resolving detectors. The aim of this paper is to evaluate the performance of this approach to quantum repeaters for long-distance quantum communications. Despite many attractive features at first sight, we show that, when using state-of-the-art photon counters and quantum memories, they do not achieve higher entanglement generation rates than repeaters based on single-photon entanglement. We discuss potential developments, which may take better advantage of the richness of entanglement based on continuous variables, including in particular efficient parity measurements.

© 2010 Optical Society of America

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.5565) Quantum optics : Quantum communications
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Continuous Variables

History
Original Manuscript: December 22, 2009
Manuscript Accepted: March 12, 2010
Published: May 4, 2010

Citation
Nicolas Sangouard, Christoph Simon, Nicolas Gisin, Julien Laurat, Rosa Tualle-Brouri, and Philippe Grangier, "Quantum repeaters with entangled coherent states," J. Opt. Soc. Am. B 27, A137-A145 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-6-A137


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