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

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

© 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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