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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 8 — Aug. 1, 2013
  • pp: 2136–2141

Optimal atomic entanglement concentration using coherent-state input–output process in low-Q cavity quantum electrodynamics system

Cong Cao, Chuan Wang, Ling-yan He, Xin Tong, Ming Lei, and Ru Zhang  »View Author Affiliations


JOSA B, Vol. 30, Issue 8, pp. 2136-2141 (2013)
http://dx.doi.org/10.1364/JOSAB.30.002136


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Abstract

This paper presents an optimal entanglement concentration protocol (ECP) for entangled solid-state systems, using the coherent-state input–output process working in the low-Q cavity quantum electrodynamics regime. The solid-state system can be described as a three-level atom confined in a one-side optical microcavity. Using the ancillary coherent optical pulse to perform the cavity input–output process, different state-dependent phase shifts of the output coherent state can be discriminated by homodyne detection, and a less-entangled atomic pair can be concentrated to maximally entangled state in a certain probability between two remote parties nonlocally. By repeating the concentration process, the remote parties can further obtain a higher success probability. Compared with conventional ECPs, only one pair of less-entangled atoms is needed in the proposed protocol, and the coherent-state input–output process is working in a low-Q cavity in the atom–cavity intermediate coupling region. With feasible technologies, this protocol may be widely used in quantum repeaters and long-distance quantum communication.

© 2013 Optical Society of America

OCIS Codes
(020.5580) Atomic and molecular physics : Quantum electrodynamics
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

History
Original Manuscript: March 14, 2013
Revised Manuscript: May 11, 2013
Manuscript Accepted: June 17, 2013
Published: July 17, 2013

Citation
Cong Cao, Chuan Wang, Ling-yan He, Xin Tong, Ming Lei, and Ru Zhang, "Optimal atomic entanglement concentration using coherent-state input–output process in low-Q cavity quantum electrodynamics system," J. Opt. Soc. Am. B 30, 2136-2141 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-8-2136

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