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Multipartite entanglement purification with quantum nondemolition detectors

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Abstract

We present a scheme for multipartite entanglement purification of quantum systems in a Greenberger-Horne-Zeilinger state with quantum nondemolition detectors (QNDs). This scheme does not require the controlled-not gates which cannot be implemented perfectly with linear optical elements at present, but QNDs based on cross-Kerr nonlinearities. It works with two steps, i.e., the bit-flipping error correction and the phase-flipping error correction. These two steps can be iterated perfectly with parity checks and simple single-photon measurements. This scheme does not require the parties to possess sophisticated single photon detectors. These features maybe make this scheme more efficient and feasible than others in practical applications.

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Authors and Affiliations

  1. Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing, 100875, P.R. China

    Y. B. Sheng, B. K. Zhao, T. J. Wang & H. Y. Zhou

  2. College of Nuclear Science and Technology, Beijing Normal University, Beijing, 100875, P.R. China

    Y. B. Sheng, B. K. Zhao, T. J. Wang & H. Y. Zhou

  3. Beijing Radiation Center, Beijing, 100875, P.R. China

    Y. B. Sheng, B. K. Zhao, T. J. Wang & H. Y. Zhou

  4. Department of Physics, Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing, 100875, P.R. China

    F. G. Deng

Authors
  1. Y. B. Sheng
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  2. F. G. Deng
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  3. B. K. Zhao
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  4. T. J. Wang
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  5. H. Y. Zhou
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Correspondence to F. G. Deng.

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Sheng, Y., Deng, F., Zhao, B. et al. Multipartite entanglement purification with quantum nondemolition detectors. Eur. Phys. J. D 55, 235–242 (2009). https://doi.org/10.1140/epjd/e2009-00237-y

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  • DOI: https://doi.org/10.1140/epjd/e2009-00237-y

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