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

Yiwu Zhu, Lei Mao, Hui Hu, Yijun Wang () and Ying Guo ()
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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

Mathematics, 2022, vol. 10, issue 23, 1-8

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.

Keywords: quantum key distribution; free space; continuous-variable; quantum communications; quantum cryptography (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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