Optimal entanglement concentration for three-photon W states with parity check measurement

doi:10.1088/1674-1056/22/2/020307

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Abstract We present an efficient entanglement concentration protocol (ECP) for the less-entangled W state with some same conventional polarized single photons. In the protocol, two of the parties say Alice and Charlie should perform the parity check measurements and they can ultimately obtain the maximally entangled W state with a certain success probability. Otherwise, they can obtain another less-entangled W state, which can be reconcentrated into the maximally entangled W state. By iterating this ECP, a high success probability can be achieved. This ECP may be an optimal one and it is useful in current quantum information processing.

Key words： quantum communication entanglement entanglement concentration

Received: 09 August 2012

:	03.67.Dd	(Quantum cryptography and communication security)
	03.67.Hk	(Quantum communication)
	03.65.Ud	(Entanglement and quantum nonlocality)

Fund:Project supported by the National Natural Science Foundation of China (Grant Nos. 11104159 and 61271238); the Scientific Research Foundation of Nanjing University of Posts and Telecommunications (Grant No. NY211008); the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, the Open Research Fund Program of National Laboratory of Solid State Microstructures, Nanjing University, (Grant Nos. M25020 and M25022); the University Natural Science Research Foundation of Jiangsu Province (Grant No. 11KJA510002); the Open Research Fund of the Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, China, and the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

Corresponding Authors: Sheng Yu-Bo

E-mail: shengyb@njupt.edu.cn

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	Zhou Lan
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Cite this article:

Zhou Lan,Sheng Yu-Bo,Zhao Sheng-Mei. Optimal entanglement concentration for three-photon W states with parity check measurement[J]. Chin. Phys. B, 2013, 22(2):020307.

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http://cpb.iphy.ac.cn/EN/10.1088/1674-1056/22/2/020307 OR http://cpb.iphy.ac.cn/EN/Y2013/V22/I2/20307

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