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arXiv quant-ph/0011007quant-ph
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纠缠光子量子密码中多对信号态的影响

The effect of multi-pair signal states in quantum cryptography with entangled photons

Miloslav Dusek, Kamil Bradler

摘要:

纠缠光子对的真实来源(如参数下转换)并不完美。它们产生的量子态以某种概率包含不止一个光子对。本文讨论了如果将这种态用于量子密钥分发会发生什么情况。它示出的存在下,“多对”信号(连同低检测效率)导致错误的传输,即使没有窃听者。此外,它示出,即使窃听,仅从这些“多对”信号中提取信息,增加了错误率。计算窃听者可以从这些信号中获得的信息。

英文摘要:

Real sources of entangled photon pairs (like parametric down conversion) are not perfect. They produce quantum states that contain more than only one photon pair with some probability. In this paper it is discussed what happens if such states are used for the purpose of quantum key distribution. It is shown that the presence of "multi-pair" signals (together with low detection efficiencies) causes errors in transmission even if there is no eavesdropper. Moreover, it is shown that even the eavesdropping, that draws information only from these "multi-pair" signals, increases the error rate. Information, that can be obtained by an eavesdropper from these signals, is calculated.

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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