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11 October 2024 Terahertz continuous-variable quantum key distribution in atmospheric environment: theory and performance analysis
Dongyun Sun, Hailin Guo, Yatao Cheng, Yitong Chen, Zijian Gu, Zhe Yang, Cunlin Zhang
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Proceedings Volume 13287, Nineteenth National Conference on Laser Technology and Optoelectronics; 1328705 (2024) https://doi.org/10.1117/12.3036646
Event: Nineteenth National Conference on Laser Technology and Optoelectronics, 2024, Shanghai, China
Abstract
Quantum Key Distribution (QKD) technology, based on the principles of quantum mechanics, provides theoretically unconditional security for information exchange, enabling effective detection and resistance against potential eavesdropping. QKD is categorized into discrete variable QKD (DVQKD) and continuous variable QKD (CVQKD), with this study focusing on theoretical analysis within the terahertz (THz) spectrum. By comparing the performance of the direct reconciliation homodyne detection protocol with the reverse reconciliation homodyne detection protocol, the secure key rate and transmission distance of the CVQKD system in the 0.1-1THz frequency range are investigated under both atmospheric absorption loss alone and the combined effects of atmospheric absorption loss and free-space path loss. The investigation further underscores the beneficial effects of increased antenna gain in mitigating losses, underscoring the critical role of judicious antenna design in maximizing the performance of QKD systems Furthermore, it reviews the latest international advancements in high-gain antennas within the 0.1-1THz band.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Dongyun Sun, Hailin Guo, Yatao Cheng, Yitong Chen, Zijian Gu, Zhe Yang, and Cunlin Zhang "Terahertz continuous-variable quantum key distribution in atmospheric environment: theory and performance analysis", Proc. SPIE 13287, Nineteenth National Conference on Laser Technology and Optoelectronics, 1328705 (11 October 2024); https://doi.org/10.1117/12.3036646
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KEYWORDS
Continuous variable quantum key distribution
Antennas
Terahertz radiation
Absorption
Signal attenuation
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