物理学报2026，Vol.75Issue(15)：246-253,8.DOI:10.7498/aps.75.20260045
利用概率整形提升非对称Y-00协议密钥分发速率
Rate optimization of key distribution based on asymmetric Y-00 protocol using probability shaping
摘要
Abstract
In the era of explosive growth in communication data,secure key distribution is urgently required to guarantee information security.Different from key distribution based on deterministic algorithms,physical-layer key distribution has attracted extensive attention owing to the inherent randomness of physical processes.Typical physical-layer key distribution methods mainly include quantum key distribution,ultra-long fiber laser,chaotic laser synchronization,fiber channel reciprocity,and the Y-00 protocol.In particular,key distribution schemes based on the Y-00 protocol exhibit great application potential,as they require no additional hardware and are fully compatible with existing optical fiber communication systems. In this paper,we propose a novel key distribution scheme combining the probability shaping technology with the Y-00 protocol.This scheme significantly optimizes signal transmission performance by adjusting the occurrence probability of QAM constellation points,thereby effectively improving the key distribution rate(KDR).Meanwhile,we analyze the effects of different probability shaping factors on the KDR and the system security,and select the optimal value as the system parameter.Furthermore,privacy amplification is introduced to compress the initial key sequence to strengthen the security of the final key,and guarantee that eavesdroppers cannot obtain any effective key information.Experimental results demonstrate that the proposed method achieves a KDR of 13.76 Mbit/s over a 25 km of standard single-mode fiber.This method provides a feasible solution for exploring a high-speed and secure physical layer key distribution compatible with current optical communication systems.关键词
物理随机数/Y-00协议/密钥分发/概率整形/保密增强Key words
physical random numbers/Y-00 protocol/key distribution/probability shaping/privacy amplification引用本文复制引用
陆晖晖,马雨心,贾志伟,秦菲菲,李璞,秦玉文,王云才..利用概率整形提升非对称Y-00协议密钥分发速率[J].物理学报,2026,75(15):246-253,8.基金项目
国家重点研发计划(批准号:2024YFB2808400)、国家自然科学基金(批准号:62531005,62322504,62305073)、广东省重点领域研发计划(批准号:2024B0101030001)、山西省基础研究计划(批准号:202203021221079)和光电融合集成与通信感知教育部重点实验室开放基金(批准号:PICCSC202505)资助的课题. Project supported by the National Key Research and Development Program of China(Grant No.2024YFB2808400),the National Natural Science Foundation of China(Grant Nos.62531005,62322504,62305073),the S&T Program of Guangdong Province,China(Grant No.2024B0101030001),the Fundamental Research Program of Shanxi Province,China(Grant No.202203021221079),and the Opening Project of the Key Laboratory of Photonic-Electronic Integration and Communication-Sensing Convergence Ministry of Education(Grant No.PICCSC202505). （批准号:2024YFB2808400）
