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离散调制的连贯状态量子密钥分布与基础编码
Mingxuan Guo1, Peng Huang1,2,3, Le Huang1
1State Key Laboratory of Photonics and Communications, Institute for Quantum Sensing and Information Processing, Shanghai Jiao Tong University, Shanghai 200240, China.
Research (Washington, D.C.)
|May 15, 2025
概括
我们引入了一种新的量子密钥分布协议,即离散调制连贯状态基础编码量子密钥分布 (DMCS-BE-QKD),它显著提高了对通道损失和噪声的耐受性. 这一进步提高了在具有挑战性的环境中安全的通信.
科学领域:
- 量子信息科学 量子信息科学
- 量子密码学 量子密码学
- 光学通讯是指光学通讯.
背景情况:
- 传统的离散调制连贯状态连续变量量子密钥分布 (DMCS-CVQKD) 与高频道噪声和损失作斗争.
- 现有的DMCS-CVQKD协议在纠错方面存在困难,并且不如高斯模块化方案那么强大.
研究的目的:
- 提出一种新的量子密钥分配协议,即离散调制的连贯状态基础编码量子密钥分配 (DMCS-BE-QKD).
- 提高量子密钥分发系统对道损失和过量噪声的耐受性.
- 简化量子密钥分布中的错误纠正机制.
主要方法:
- 在两个离散调制连贯状态的随机选择的两个测量基 (X和P的并列方程) 中编码秘密密钥.
- 分析DMCS-BE-QKD协议的秘密密钥率在线性高斯通道中的个人和集体攻击下.
- 在50.5公里的光纤上进行一项原理证明实验.
主要成果:
- 与原来的DMCS-CVQKD相比,DMCS-BE-QKD协议显示了对通道损失和过量噪声的显著增强的耐受性.
- 新协议可以比原来的DMCS-CVQKD承受大约40dB的频道损失,以实现现实的噪声水平.
- 实验验证证了DMCS-BE-QKD在50.5公里光纤上的可行性.
结论:
- 对于量子密钥分配系统来说,DMCS-BE-QKD在稳定性方面提供了显著的改进.
- 该协议与现有的DMCS-CVQKD基础设施的兼容性有助于其实际部署.
- 在苛刻的环境中,DMCS-BE-QKD作为安全量子加密的有价值的乘数.
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