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arXiv 1202.0883quant-ph
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改进的四态连续变量长距离量子密钥分发

Improved Four-state Continuous-variable Quantum Key Distribution with Long Secure Distance

Jian Yang, Bingjie Xu, Xiang Peng, Hong Guo

摘要:

四态连续变量量子密钥分发(CVQKD)协议具有较长的实用安全距离\cite{Leverrier_PRL_2009},但存在参数估计困难的问题。我们提出了一种改进的四状态协议,其中的协方差矩阵可以估计从实验数据,而不使用线性信道假设,从而确保其在渐近极限的无条件安全。新方案保留了四态协议协调效率高、安全距离长的优点,并且可以在现有技术条件下实现。

英文摘要:

The four-state continuous-variable quantum key distribution (CVQKD) protocol has a long practical secure distance \cite{Leverrier_PRL_2009}, while it has the difficulty of parameter estimation. We propose an improved four-state protocol, where the covariance matrix can be estimated from experimental data without using the linear channel assumption, and thus ensuring its unconditional security in the asymptotical limit. Our new scheme keeps the advantages of high reconciliation efficiency and long secure distance of the four-state protocol, and it can be implemented under current technology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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