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Controlling Continuous-Variable Quantum Key Distribution with Entanglement in the Middle Using Tunable Linear Optics Cloning Machines

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Abstract

Continuous-variable quantum key distribution (CVQKD) can provide detection efficiency, as compared to discrete-variable quantum key distribution (DVQKD). In this paper, we demonstrate a controllable CVQKD with the entangled source in the middle, contrast to the traditional point-to-point CVQKD where the entanglement source is usually created by one honest party and the Gaussian noise added on the reference partner of the reconciliation is uncontrollable. In order to harmonize the additive noise that originates in the middle to resist the effect of malicious eavesdropper, we propose a controllable CVQKD protocol by performing a tunable linear optics cloning machine (LOCM) at one participant’s side, say Alice. Simulation results show that we can achieve the optimal secret key rates by selecting the parameters of the tuned LOCM in the derived regions.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61379153, 61572529), and partly by China Postdoctoral Science Foundation (Grant Nos. 2013M542119, 2014T70772), Science and Technology Planning Project of Hunan Province, China (Grant No. 2015RS4032).

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Authors and Affiliations

  1. School of Traffic & Transportation Engineering, Central South University, Changsha, 410083, China

    Xiao Dong Wu, Feng Chen & Xiang Hua Wu

  2. School of Information Science & Engineering, Central South University, Changsha, 410083, China

    Ying Guo

  3. School of Physics Science & Information Engineering, Hunan Normal University, Changsha, 410006, China

    Ying Guo

Authors
  1. Xiao Dong Wu
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  2. Feng Chen
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  3. Xiang Hua Wu
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  4. Ying Guo
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Correspondence to Ying Guo.

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Wu, X.D., Chen, F., Wu, X.H. et al. Controlling Continuous-Variable Quantum Key Distribution with Entanglement in the Middle Using Tunable Linear Optics Cloning Machines. Int J Theor Phys 56, 415–426 (2017). https://doi.org/10.1007/s10773-016-3183-8

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  • DOI: https://doi.org/10.1007/s10773-016-3183-8

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