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Subcarrier multiplexing multiple-input multiple-output quantum key distribution scheme with orthogonal quantum states

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Abstract

Quantum key distribution (QKD) system is presently being developed for providing high-security transmission in future free-space optical communication links. However, current QKD technique restricts quantum secure communication to a low bit rate. To improve the QKD bit rate, we propose a subcarrier multiplexing multiple-input multiple-output quantum key distribution (SCM-MQKD) scheme with orthogonal quantum states. Specifically, we firstly present SCM-MQKD system model and drive symmetrical SCM-MQKD system into decoherence-free subspaces. We then utilize bipartite Werner and isotropic states to construct multiple parallel single photon with orthogonal quantum states that are invariant for unitary operations. Finally, we derive the density matrix and the capacity of SCM-MQKD system, respectively. Theoretical analysis and numerical results show that the capacity of SCM-MQKD system will increase \({\log _2}(N^2+1)\) times than that of single-photon QKD system.

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Acknowledgements

The authors acknowledge the support from the National Natural Science Foundation of China under Grants 61261018 and 61472094, Guangxi Natural Science Foundation under Grants 2014GXNSFGA118007, and the open research fund of National Mobile Communications Research Laboratory, Southeast University (No. 2015D05).

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Authors and Affiliations

  1. College of Physics and Electronic Information Engineering, Wenzhou University, Wenzhou, 325035, China

    Hailin Xiao

  2. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 210096, China

    Hailin Xiao

  3. School of Information and Communication, Guilin University of Electronic Technology, Guilin, 541004, China

    Hailin Xiao

  4. Beijing Engineering and Technology Research, Center for Convergence Networks and Ubiquitous Services, University of Science and Technology Beijing, Beijing, 100083, China

    Zhongshan Zhang

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  1. Hailin Xiao
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Xiao, H., Zhang, Z. Subcarrier multiplexing multiple-input multiple-output quantum key distribution scheme with orthogonal quantum states. Quantum Inf Process 16, 13 (2017). https://doi.org/10.1007/s11128-016-1474-x

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