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arXiv quant-ph/0602158quant-ph
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基于能量-时间测不准关系的单光子连续变量量子密钥分发

Single photon continuous variable quantum key distribution based on energy-time uncertainty relation

Bing Qi

摘要:

在以往的量子密钥分发(QKD)协议中,信息要么被编码在单光子信号的离散变量上,要么被编码在多光子信号的连续变量上。在这里,我们提出了一个新的量子密钥分配协议,通过编码的信息连续变量的单光子。在该协议中,Alice随机编码她的窄带单光子脉冲的中心频率或宽带单光子脉冲的时间延迟信息,而Bob随机选择进行频率测量或时间测量。该协议的安全性依赖于能量-时间不确定性关系,这可以防止Eve同时以任意高的分辨率确定频率和时间信息。在实践中,该方案可以对各种信道噪声(诸如极化和相位波动)更加鲁棒。

英文摘要:

In previous quantum key distribution (QKD) protocols, information is encoded on either the discrete-variable of single-photon signal or continuous-variables of multi-photon signal. Here, we propose a new QKD protocol by encoding information on continuous-variables of a single photon. In this protocol, Alice randomly encodes her information on either the central frequency of a narrow-band single photon pulse or the time-delay of a broadband single photon pulse, while Bob randomly chooses to do either frequency measurement or time measurement. The security of this protocol rests on the energy-time uncertainty relation, which prevents Eve from simultaneously determining both frequency and time information with arbitrarily high resolution. In practice, this scheme may be more robust against various channel noises, such as polarization and phase fluctuations.

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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