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Statistical fluctuation analysis for decoy-state quantum secure direct communication

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Abstract

In quantum secure direct communication (QSDC), messages are transmitted directly through quantum channels. The decoy state scheme has been widely studied to detect eavesdroppers and improve the secrecy capacity. However, the secret key rate becomes relatively low in this scheme because of the finite-size effect. In this study, the statistical fluctuation analyses of a four-intensity decoy-state QSDC system were performed, and a numerical simulation was conducted in an actual experimental environment. The simulation results were compared, and the parameters optimized using the Gaussian analysis and the Chernoff bound were presented.

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Acknowledgements

This work was supported by Institute of Information & communications Technology Planning & Evaluation (IITP) grant funded by the Korea government(MSIT) (No.2022-0-00463, Development of a quantum repeater in optical fiber networks for quantum internet). This research was supported by the MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program(IITP-2023-2021-0-01810) supervised by the IITP(Institute for Information & Communications Technology Planning & Evaluation).

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  1. School of Electrical Engineering, Korea University, Seoul, 02841, Korea

    Jooyoun Park, Bumil Kim & Jun Heo

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  1. Jooyoun Park
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Correspondence to Jun Heo.

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Park, J., Kim, B. & Heo, J. Statistical fluctuation analysis for decoy-state quantum secure direct communication. Quantum Inf Process 22, 112 (2023). https://doi.org/10.1007/s11128-023-03845-1

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