Intensity fluctuation analysis for sending or not sending twin field quantum key distribution

Ke Wen; Li Fei; Zi-Ao Wan; Xia-Ying Wu; Hai-Tao Li; Han Peng; Peng-Fei Gong; Ming Fang; Ya-Ping Li

doi:10.1117/12.2666452

4 April 2023 Intensity fluctuation analysis for sending or not sending twin field quantum key distribution

Ke Wen, Li Fei, Zi-Ao Wan, Xia-Ying Wu, Hai-Tao Li, Han Peng, Peng-Fei Gong, Ming Fang, Ya-Ping Li

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261755 (2023) https://doi.org/10.1117/12.2666452
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

Quantum Key Distribution (QKD) allows authenticated users to share secure keys, which has the advantage of information-theoretical security based on the fundamental laws of quantum physics. The breakthrough of long-distance QKD technology is the key to the large-scale application of quantum communication. The Twin-Field QKD (TF-QKD) protocol is an effective solution to overcome the linear secret key capacity bound, which is called the Pirandola-Laurenza-Ottaviani-Banchi (PLOB) bound. Among all TF-QKD protocols, the Sending or Not Sending (SNS) TF-QKD protocol has received extensive attention due to its advantage of tolerating large misalignment. In this paper, we analyze the influence of light intensity fluctuation on the secure key rate and transmission distance for the three-intensity decoy SNS-TF-QKD protocol considering the finite-key effect. Based on our proposed optimized key rate formula, we conducted a simulation analysis and found that a light intensity fluctuation within 2% has little effect on the farthest transmission distance of the three-intensity decoy SNS-TF-QKD. Even if the light intensity fluctuates up to 10%, the secure key rate can still break the PLOB bound.

Citation Download Citation

Ke Wen, Li Fei, Zi-Ao Wan, Xia-Ying Wu, Hai-Tao Li, Han Peng, Peng-Fei Gong, Ming Fang, and Ya-Ping Li "Intensity fluctuation analysis for sending or not sending twin field quantum key distribution", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261755 (4 April 2023); https://doi.org/10.1117/12.2666452

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KEYWORDS

Quantum key distribution

Lawrencium

Relays

Information security

Sensors

Vacuum

Lithium

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