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弱相干源、噪声和有耗信道下Bennett-Bennard 1984量子密钥分发协议的优化实验方案

Optimal Experimental Scheme for Bennett-Brassard 1984 Quantum Key Distribution Protocol with Weak Coherent Sources, Noisy and Lossy Channel

Qing-yu Cai

摘要:

这是第一个能同时精确测量到达信号光子数和多光子脉冲量子误码率的方案。我们发现,标记多光子脉冲计数的分数的上限是$μ$,这是独立的信道损耗和强度的诱饵源。这样的上界是$inherent$,并且只要使用弱相干源和高损耗信道,就不能再减小。我们表明,我们的计划可以实现,即使信道损耗是非常高的。为了提高量子密钥分发的速率,可以采用较强的脉冲源强度。在验证了通信的安全性之后,可以使用信号脉冲和诱饵脉冲来生成原始密钥。我们分析了我们的方案是最优的,在今天的技术。PACS:03.67.Dd

英文摘要:

It is the first scheme which allows the detection apparatus to achieve both the photon number of arriving signals and quantum bit error rate of the multiphoton pulses precisely. We show that the upper bound of the fraction of the tagged multiphoton pulses counts is $μ$, which is independent of the channel loss and the intensity of the decoy source. Such upper bound is $inherent$ and cannot be reduced any longer as long as the weak coherent scouces and high lossy channel are used. We show that our scheme can be implemented even if the channel loss is very high. A stronger intensity of the pulse source is allowable to improve the rate of quantum key distribution. Both the signal pulses and decoy pulses can be used to generate the raw key after verified the security of the communication. We analyze that our scheme is optimal under today's technology. PACS: 03.67.Dd

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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