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Open AccessArticle

Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel

1
School of Automation, Central South University, Changsha 410083, China
2
School of Computer Science and Engineering, Central South University, Changsha 410083, China
3
School of Economics and Management, Jingzhou Institute of Technology, Jingzhou 434020, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(22), 4956; https://doi.org/10.3390/app9224956
Received: 16 October 2019 / Revised: 13 November 2019 / Accepted: 14 November 2019 / Published: 18 November 2019
(This article belongs to the Special Issue Quantum Communications and Quantum Networks)
We investigate the optical absorption and scattering properties of four different kinds of seawater as the quantum channel. The models of discrete-modulated continuous-variable quantum key distribution (CV-QKD) in free-space seawater channel are briefly described, and the performance of the four-state protocol and the eight-state protocol in asymptotic and finite-size cases is analyzed in detail. Simulation results illustrate that the more complex is the seawater composition, the worse is the performance of the protocol. For different types of seawater channels, we can improve the performance of the protocol by selecting different optimal modulation variances and controlling the extra noise on the channel. Besides, we can find that the performance of the eight-state protocol is better than that of the four-state protocol, and there is little difference between homodyne detection and heterodyne detection. Although the secret key rate of the protocol that we propose is still relatively low and the maximum transmission distance is only a few hundred meters, the research on CV-QKD over the seawater channel is of great significance, which provides a new idea for the construction of global secure communication network. View Full-Text
Keywords: discrete modulation; seawater channel; continuous-variable quantum key distribution discrete modulation; seawater channel; continuous-variable quantum key distribution
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MDPI and ACS Style

Ruan, X.; Zhang, H.; Zhao, W.; Wang, X.; Li, X.; Guo, Y. Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel. Appl. Sci. 2019, 9, 4956.

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