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Adaptive Continuous-Variable Quantum Key Distribution with Discrete Modulation Regulative in Free Space

Author

Listed:
  • Yiwu Zhu

    (School of Automation, Central South University, Changsha 410083, China)

  • Lei Mao

    (School of Automation, Central South University, Changsha 410083, China)

  • Hui Hu

    (School of Automation, Central South University, Changsha 410083, China)

  • Yijun Wang

    (School of Automation, Central South University, Changsha 410083, China)

  • Ying Guo

    (School of Automation, Central South University, Changsha 410083, China
    School of Computer Science, Beijing University of Posts and Telecommunications, Beijing 100876, China)

Abstract

The finite sampling bandwidth of an analog-to-digital converter has a negative effect on the continuous-variable quantum key distribution (CVQKD), which leaves a potential loophole for an eavesdropper and weakens the practical security of the system. To compensate for the loss in free space, we deploy an adaptive optics (AO) unit in the detector of the CVQKD system with discrete modulations. Since the closed-loop control bandwidth of the embedded AO unit can be optimized with the sampling frequency, the practical security of the system can be enhanced in terms of the secret key rate. The security analysis is demonstrated on the basis of the derived secret key rate with numerical simulations, providing a feasible implementation of CVQKD in realistic free-space environments.

Suggested Citation

  • Yiwu Zhu & Lei Mao & Hui Hu & Yijun Wang & Ying Guo, 2022. "Adaptive Continuous-Variable Quantum Key Distribution with Discrete Modulation Regulative in Free Space," Mathematics, MDPI, vol. 10(23), pages 1-8, November.
    • Handle: RePEc:gam:jmathe:v:10:y:2022:i:23:p:4450-:d:984274
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    References listed on IDEAS

    as
    1. Frédéric Grosshans & Gilles Van Assche & Jérôme Wenger & Rosa Brouri & Nicolas J. Cerf & Philippe Grangier, 2003. "Quantum key distribution using gaussian-modulated coherent states," Nature, Nature, vol. 421(6920), pages 238-241, January.
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    Cited by:

    1. Saeed Haddadi & Maryam Hadipour & Soroush Haseli & Atta Ur Rahman & Artur Czerwinski, 2023. "Quantum Advantages of Teleportation and Dense Coding Protocols in an Open System," Mathematics, MDPI, vol. 11(6), pages 1-14, March.

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