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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. 10 — Oct. 1, 2010
  • pp: 2159–2164

Linear-optics-based entanglement concentration of unknown partially entangled three-photon W states

Hong-Fu Wang, Shou Zhang, and Kyu-Hwang Yeon  »View Author Affiliations


JOSA B, Vol. 27, Issue 10, pp. 2159-2164 (2010)
http://dx.doi.org/10.1364/JOSAB.27.002159


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Abstract

We propose two experimental schemes for concentrating entanglement in unknown partially entangled three-photon W states with only linear optical elements and the conventional photon detectors. We first propose a heralded scheme using a heralded controlled-NOT (CNOT) gate between two photons. Then we simplify this method to a post-selected one requiring time entanglement of the input photons without using ancillary photons. In the two schemes, Alice, Bob, and Charlie at three distant parties can obtain one maximally entangled three-photon W state from two identical partially entangled three-photon W states, taking the specific form of α | H | H | V + β ( | H | V | H + | V | H | H ) , by local operations and classical communication. We discuss and consider the success probabilities and the practical realizations of the schemes.

© 2010 Optical Society of America

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

ToC Category:
Quantum Optics

History
Original Manuscript: June 7, 2010
Revised Manuscript: August 19, 2010
Manuscript Accepted: August 24, 2010
Published: September 29, 2010

Citation
Hong-Fu Wang, Shou Zhang, and Kyu-Hwang Yeon, "Linear-optics-based entanglement concentration of unknown partially entangled three-photon W states," J. Opt. Soc. Am. B 27, 2159-2164 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-10-2159

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