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Efficient entanglement concentration for quantum dot and optical microcavities systems

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Abstract

A recent paper (Chuan Wang in Phys Rev A 86:012323, 2012) discussed an entanglement concentration protocol (ECP) for partially entangled electrons using a quantum dot and microcavity coupled system. In his paper, each two-electron spin system in a partially entangled state can be concentrated with the assistance of an ancillary quantum dot and a single photon. In this paper, we will present an efficient ECP for such entangled electrons with the help of only one single photon. Compared with the protocol of Wang, the most significant advantage is that during the whole ECP, the single photon only needs to pass through one microcavity which will increase the total success probability if the cavity is imperfect. The whole protocol can be repeated to get a higher success probability. With the feasible technology, this protocol may be useful in current long-distance quantum communications.

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Authors and Affiliations

  1. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Yu-Bo Sheng, Lan Zhou, Lei Wang & Sheng-Mei Zhao

  2. Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing, 210003, China

    Yu-Bo Sheng, Lei Wang & Sheng-Mei Zhao

  3. College of Mathematics and Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

Authors
  1. Yu-Bo Sheng
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  2. Lan Zhou
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  3. Lei Wang
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  4. Sheng-Mei Zhao
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Correspondence to Yu-Bo Sheng.

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Sheng, YB., Zhou, L., Wang, L. et al. Efficient entanglement concentration for quantum dot and optical microcavities systems. Quantum Inf Process 12, 1885–1895 (2013). https://doi.org/10.1007/s11128-012-0502-8

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  • DOI: https://doi.org/10.1007/s11128-012-0502-8

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