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Open AccessArticle

Performance Improvement of Underwater Continuous-Variable Quantum Key Distribution via Photon Subtraction

by Qingquan Peng 1,2, Guojun Chen 1, Xuan Li 3, Qin Liao 4,* and Ying Guo 2,*
1
Jiangsu Key Construction Laboratory of IoT Application Technology, School of IoT Engineering, Wuxi Taihu University, Wuxi 214064, China
2
School of Automation, Central South University, Changsha 410083, China
3
School of Economics and Management, Jingzhou Institute of Technology, Jingzhou 434020, China
4
College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China
*
Authors to whom correspondence should be addressed.
Entropy 2019, 21(10), 1011; https://doi.org/10.3390/e21101011
Received: 19 September 2019 / Revised: 14 October 2019 / Accepted: 16 October 2019 / Published: 17 October 2019
(This article belongs to the Collection Quantum Information)
Considering the ocean water’s optical attenuation is significantly larger than that of Fiber Channel, we propose an approach to enhance the security of underwater continuous-variable quantum key distribution (CVQKD). In particular, the photon subtraction operation is performed at the emitter to enhance quantum entanglement, thereby improving the underwater transmission performance of the CVQKD. Simulation results show that the photon subtraction operation can effectively improve the performance of CVQKD in terms of underwater transmission distance. We also compare the performance of the proposed protocol in different water qualities, which shows the advantage of our protocol against water deterioration. Therefore, we provide a suitable scheme for establishing secure communication between submarine and submarine vehicles. View Full-Text
Keywords: continuous variable quantum key distribution; photon subtraction operation; underwater channel continuous variable quantum key distribution; photon subtraction operation; underwater channel
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MDPI and ACS Style

Peng, Q.; Chen, G.; Li, X.; Liao, Q.; Guo, Y. Performance Improvement of Underwater Continuous-Variable Quantum Key Distribution via Photon Subtraction. Entropy 2019, 21, 1011.

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