For secure practical systems, quantum key distribution (QKD) must provide high key rates over long distances. Time-entanglement-based QKD promises to increase the secret key rate and distribution distances compared to other QKD implementations. This article describes the major steps in QKD protocols, focusing on the nascent QKD technology based on high-dimensional time-bin entangled photons. We overview state-of-the-art from the information and coding theory perspective. In particular, we discuss the key rate loss due to single-photon detector imperfections. We hope the open questions posed and discussed in this paper will inspire information and coding theorists to contribute to and impact fledgling quantum applications and influence future quantum communication systems.
翻译:对于安全的实用系统,量子键分布(QKD)必须提供长距离的高关键率。基于时间缠绕的QKD承诺与其他QKD的实施相比,增加秘密关键率和分布距离。本篇文章描述了QKD协议中的主要步骤,重点是基于高维时间键缠绕的光子的新生QKD技术。我们从信息和编码理论的角度来概述最新技术。我们特别讨论了单发体检测器不完善导致的关键率损失。我们希望本文中提出和讨论的开放问题将激发信息,并编译理论家,以对新兴量子应用作出贡献和影响,并影响未来的量子通信系统。</s>