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Multi-photon Entanglement Concentration Protocol for Partially Entangled W States with Projection Measurement

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Abstract

We propose a novel entanglement concentration protocol (ECP) for nonlocal N-photon systems in a partially entangled pure W-class state, following some ideas in the work by Deng (Phys. Rev. A 85:022311, 2012). Our ECP resorts to an ancillary single photon and the projection measurement on it. Compared with other ECPs for W-class states, our ECP requires only one copy of the multipartite entangled system in a partially entangled W-class pure state, not two copies, which reduces the difficulty of its implementation largely. Moreover, it requires only one of the N parties in quantum communication to perform the local unitary operation for reconstructing the standard W state from the W-class state and it only resorts to linear optical elements for its implementation. All these advantages make our ECP more feasible than others in practical applications in quantum communication.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant No. 11105075) and the Natural Science Foundation of Jiangsu Provincial Universities (Grant No. 10KJB180004).

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Authors and Affiliations

  1. College of Physics and Optoelectronic Technology, Nanjing University of Information Science and Technology, Nanjing, 210044, P.R. China

    Bin Gu, Dong-hui Quan & Shao-rong Xiao

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  1. Bin Gu
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  2. Dong-hui Quan
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  3. Shao-rong Xiao
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Correspondence to Bin Gu.

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Gu, B., Quan, Dh. & Xiao, Sr. Multi-photon Entanglement Concentration Protocol for Partially Entangled W States with Projection Measurement. Int J Theor Phys 51, 2966–2973 (2012). https://doi.org/10.1007/s10773-012-1178-7

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  • DOI: https://doi.org/10.1007/s10773-012-1178-7

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