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arXiv 1108.4540quant-ph
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高维广义量子密钥分发

General Quantum Key Distribution in Higher Dimension

Zhao-Xi Xiong, Han-Duo Shi, Yi-Nan Wang, Li Jing, Jin Lei, Liang-Zhu Mu, Heng Fan

摘要:

研究了一种高维的通用量子密钥分发协议。在该协议中,d维系统中的所有$d+1$相互无偏基中的任意$g+1$($1\le g\le d$)中的量子态可以用于密钥编码。这提供了更高维的量子密钥分发的自然推广,并恢复了先前已知的$g=1$和$d$的结果。在我们的调查中,我们通过两种略有不同的方法来研究夏娃的攻击。一个是考虑Eve的最佳克隆者,另一个被定义为最佳攻击,是最大化Eve的信息。我们推导出这两种方法的结果,并显示从最佳攻击的最佳克隆的偏差。通过对更高维的量子密钥分发协议的系统研究,可以通过改变密钥编码的基数来平衡安全增益和实现代价。作为副产品,我们还证明了最优相位协变量子克隆机和$g=d-1$量子密钥分发的最优克隆机之间的等价性。

英文摘要:

We study a general quantum key distribution protocol in higher dimension. In this protocol, quantum states in arbitrary $g+1$ ($1\le g\le d$) out of all $d+1$ mutually unbiased bases in a d-dimensional system can be used for the key encoding. This provides a natural generalization of the quantum key distribution in higher dimension and recovers the previously known results for $g=1$ and $d$. In our investigation, we study Eve's attack by two slightly different approaches. One is considering the optimal cloner for Eve, and the other, defined as the optimal attack, is maximizing Eve's information. We derive results for both approaches and show the deviation of the optimal cloner from the optimal attack. With our systematic investigation of the quantum key distribution protocols in higher dimension, one may balance the security gain and the implementation cost by changing the number of bases in the key encoding. As a side product, we also prove the equivalency between the optimal phase covariant quantum cloning machine and the optimal cloner for the $g=d-1$ quantum key distribution.

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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