论文标题
双场量子键分布没有光频率传播
Twin-field quantum key distribution without optical frequency dissemination
论文作者
论文摘要
双场（TF）量子密钥分布（QKD）迅速成为长距离安全纤维通信的最可行解决方案，这要归功于其从根本上重复使用的速率降低率。但是，其实施复杂性（即使没有成功解决）可能会阻碍甚至阻止其发展成为现实世界。为了满足其对双场连贯性的需求，所有当前的设置本质上都采用了巨大的，资源感知的干涉仪结构，该结构缺乏可扩展性，而成熟QKD系统则使用单纯量量子链路提供。在这里，我们引入了一种新型技术，该技术可以在不使用封闭干涉仪的情况下稳定开放通道，并且对相敏感量子通信具有一般适用性。使用本地生成的频率梳子来建立相互的连贯性，我们开发了一种简单且通用的TF-QKD设置，该设置不需要服务光纤，并且可以通过100 km不对称的链接进行操作。我们确认设置的中继器状行为，并在615.6公里处获得0.32位/s的有限尺寸速率。
Twin-field (TF) quantum key distribution (QKD) has rapidly risen as the most viable solution to long-distance secure fibre communication thanks to its fundamentally repeater-like rate-loss scaling. However, its implementation complexity, if not successfully addressed, could impede or even prevent its advance into real-world. To satisfy its requirement for twin-field coherence, all present setups adopted essentially a gigantic, resource-inefficient interferometer structure that lacks scalability that mature QKD systems provide with simplex quantum links. Here we introduce a novel technique that can stabilise an open channel without using a closed interferometer and has general applicability to phase-sensitive quantum communications. Using locally generated frequency combs to establish mutual coherence, we develop a simple and versatile TF-QKD setup that does not need service fibre and can operate over links of 100 km asymmetry. We confirm the setup's repeater-like behaviour and obtain a finite-size rate of 0.32 bit/s at a distance of 615.6 km.
