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Logic Bell state concentration with parity check measurement

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Abstract

Logic qubit plays an important role in current quantum communication. In this paper, we propose an efficient entanglement concentration protocol (ECP) for a new kind of logic Bell state, where the logic qubit is the concatenated Greenber–Horne–Zeilinger (C-GHZ) state. Our ECP relies on the nondemolition polarization parity check (PPC) gates constructed with cross-Kerr nonlinearity, and can distill one pair of maximally entangled logic Bell state from two same pairs of less-entangled logic Bell states. Benefit from the nondemolition PPC gates, the concentrated maximally entangled logic Bell state can be remained for further application. Moreover, our ECP can be repeated to further concentrate the less-entangled logic Bell state. By repeating the ECP, the total success probability can be effectively increased. Based on above features, this ECP may be useful in future long-distance quantum communication.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 11474168 and 11747161.

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Authors and Affiliations

  1. Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Jiu Liu, Wei Zhong & Yu-Bo Sheng

  2. School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

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

    Yu-Bo Sheng

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  1. Jiu Liu
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Correspondence to Yu-Bo Sheng.

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Liu, J., Zhou, L., Zhong, W. et al. Logic Bell state concentration with parity check measurement. Front. Phys. 14, 21601 (2019). https://doi.org/10.1007/s11467-018-0866-z

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