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Extended single-photon entanglement-based phase-matching quantum key distribution

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Abstract

Twin-field quantum key distribution (TF-QKD) is a hot topic in the field of quantum information due to its potential to break the key rate linear bound. Among all the variants, the single-photon entanglement-based phase-matching QKD protocol (SEPM-QKD) has been proposed, which is an entangled version of TF-QKD. However, a significant defect of SEPM-QKD is that its key rate is much lower than other QKDs. In this paper, we proposed an extended SEPM-QKD protocol with the help of delocalized state measurement. The proposed scheme can be regarded as TF-QKD connected by a single-photon entanglement-based quantum repeater. A security proof based on entanglement purification protocol in wave-state space against all channel attacks has been presented. Violation of CHSH-type Bell’s inequality is used to test the delocalized quantum correlation of the source. The simulation results show that the key rate of extended SEPM-QKD has the same performance as phase-matching (PM)-QKD and TF-QKD, while the communication distance is almost twice that of them.

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Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

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Acknowledgements

This work is supported by China Postdoctoral special funding project (2020T130289), the National Natural Science Foundation of China (No. 61871234).

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Authors and Affiliations

  1. National Laboratory of Solid State Microstructures, Nanjing University, Hankou Road, Nanjing, 210093, Jiangsu, China

    Wei Li

  2. Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Xinmofan Road, Nanjing, 210003, Jiangsu, China

    Wei Li, Le Wang & Shengmei Zhao

  3. Key Lab Broadband Wireless Communication and Sensor Network of Ministy of Education, Nanjing University of Posts and Telecommunications, Xinmofan Road, Nanjing, 210003, Jiangsu, China

    Wei Li, Le Wang & Shengmei Zhao

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  1. Wei Li
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  2. Le Wang
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Correspondence to Wei Li.

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Li, W., Wang, L. & Zhao, S. Extended single-photon entanglement-based phase-matching quantum key distribution. Quantum Inf Process 21, 124 (2022). https://doi.org/10.1007/s11128-022-03464-2

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