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arXiv 2108.08698quant-ph
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具有无源时间相关源侧信道的测量设备无关的量子密钥分发

Measurement device-independent quantum key distribution with passive, time-dependent source side-channels

J. Eli Bourassa, Amita Gnanapandithan, Li Qian, Hoi-Kwong Lo

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19 pages, 10 figures
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摘要：

虽然测量设备无关（MDI）量子密钥分发（QKD）允许两个可信方从远处建立共享密钥，而无需信任中央检测节点，但它们的量子源必须具有良好的特征，源处的侧信道对协议的安全性构成最大的漏洞。在本文中，我们确定了一个时间依赖的侧通道，在共同的偏振为基础的QKD源，采用法拉第镜相位稳定。我们应用最近开发的数值证明技术[Phys. Rev. A 99，062332（2019）]来量化密钥速率对侧信道量子光学模型的敏感性，并制定减轻信息泄漏的策略。特别是，我们发现MDI三态和BB84协议，虽然在理想条件下产生相同的密钥速率，但在存在侧信道的情况下具有不同的结果，BB84证明更有利。虽然我们只考虑一个有代表性的案例，我们希望开发的策略和关键率分析方法，可广泛适用于其他泄漏源。

英文摘要：

While measurement-device-independent (MDI) quantum key distribution (QKD) allows two trusted parties to establish a shared secret key from a distance without needing to trust a central detection node, their quantum sources must be well-characterized, with side-channels at the source posing the greatest loophole to the protocol's security. In this paper, we identify a time-dependent side-channel in a common polarization-based QKD source that employs a Faraday mirror for phase stabilization. We apply the recently developed numerical proof technique from [Phys. Rev. A 99, 062332 (2019)] to quantify the sensitivity of the secret key rate to the quantum optical model for the side-channel, and to develop strategies to mitigate the information leakage. In particular, we find that the MDI three-state and BB84 protocols, while yielding the same key rate under ideal conditions, have diverging results in the presence of a side-channel, with BB84 proving more advantageous. While we consider only a representative case example, we expect the strategies developed and key rate analysis method to be broadly applicable to other leaky sources.

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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