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arXiv quant-ph/0609137quant-ph
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一种简单的松受控源安全诱骗态量子密钥分发协议

Simple protocol for secure decoy-state quantum key distribution with a loosely controlled source

Xiang-Bin Wang, Cheng-Zhi Peng, Jian-Wei Pan

摘要:

诱骗态量子密钥分发(QKD)方法对光脉冲的强度有不同的要求。现有的理论假设强度是精确控制的。在这里,我们提出了一个简单的协议,这是安全和有效的,即使有错误的强度控制。在我们的协议中,诱饵脉冲和信号脉冲是从相同的父亲脉冲产生的两个值的衰减。在给定父脉冲波动上界的条件下,只要精确地进行二值衰减,我们的协议是安全的。我们建议使用非平衡分束器来实现稳定的衰减。在强度误差以$\pm5%$为界的条件下,在相同的密钥速率下,该方法的安全距离仅比具有精确受控源的理想协议短1km.

英文摘要:

The method of decoy-state quantum key distribution (QKD) requests different intensities of light pulses. Existing theory has assumed exact control of intensities. Here we propose a simple protocol which is secure and efficient even there are errors in intensity control. In our protocol, decoy pulses and signal pulses are generated from the same father pulses with a two-value attenuation. Given the upper bound of fluctuation of the father pulses, our protocol is secure provided that the two-value attenuation is done exactly. We propose to use unbalanced beam-splitters for a stable attenuation. Given that the intensity error is bounded by $\pm5%$, with the same key rate, our method can achieve a secure distance only 1 km shorter than that of an ideal protocol with exactly controlled source.

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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