arXiv 1902.052432019-02-14quant-ph

有效的无源测量设备无关的量子密钥分发

Efficient passive measurement-device-independent quantum key distribution

Chun-Hui Zhang, Chun-Mei Zhang, Qin Wang

发表信息：: Phys. Rev. A 99, 052325 (2019)
DOI：: 10.1103/PhysRevA.99.052325

摘要：

与测量设备无关的量子密钥分发（MDI-QKD）是目前所有实用的量子密钥分发协议中安全性最高的一种。然而，现有的多强度诱饵态方法可能会导致漏洞时，调制光强度与实际设备。在本文中，我们提出了一个被动的诱饵态MDI-QKD协议的基础上的一种新的结构的预示单光子源。该方法不需要对光源进行不同强度的调制，避免了诱骗态的调制信息泄露给窃听者，提高了MDI-QKD的安全性。此外，通过结合被动诱饵状态和偏基选择，我们的协议可以表现出明显的优势相比，最先进的MDI-QKD方案，即使在有限的密钥大小的影响被考虑在内。因此，我们目前的被动诱饵态MDI-QKD似乎是一个有希望的候选人，实际实施的量子密钥分发在不久的将来。

英文摘要：

The measurement-device-independent quantum key distribution (MDI-QKD) possesses the highest security among all practical quantum key distribution protocols. However, existing multi-intensity decoy-state methods may cause loopholes when modulating light intensities with practical devices. In this paper, we propose a passive decoy-state MDI-QKD protocol based on a novel structure of heralded single-photon sources. It does not need to modulate the light source into different intensities and thus can avoid leaking modulation information of decoy states to eavesdroppers, enhancing the security of practical MDI-QKD. Furthermore, by combining the passive decoy states and biased basis choices, our protocol can exhibit distinct advantages compared with state-of-the art MDI-QKD schemes even when the finite key-size effect is taken into account. Therefore, our present passive decoy-state MDI-QKD seems a promising candidate for practical implementation of quantum key distributions in the near future.

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。

摘要：

英文摘要：

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