论文标题
通过轨道角动量卫星到地球量子键分布
Satellite-to-Earth Quantum Key Distribution via Orbital Angular Momentum
论文作者
论文摘要
在这项工作中，我们探讨了使用光轨道角动量（OAM）进行卫星至地球量子键分布（QKD）的可行性。由于OAM的脆弱性，传统的观点是湍流会在卫星到地球通道中使OAM-QKD不可行。但是，基于对预期大气湍流的详细相屏幕模拟，我们发现OAM-QKD在某些系统配置中很可行，尤其是在处理后选择状态的量子通道信息时。更具体地说，使用经典的纠缠光作为量子通道的探测器以及大小的发射器接收器的光圈，我们发现在海平面地面站上可以实现非零QKD速率。不使用经典的光探针，OAM-QKD被降级为具有较大接收器孔径的高空地面站。我们的工作代表了对卫星OAM-QKD性能的首次定量评估，这表明在哪些情况下，可以在安全通信的背景下使用较高的OAM较高维度。
In this work, we explore the feasibility of performing satellite-to-Earth quantum key distribution (QKD) using the orbital angular momentum (OAM) of light. Due to the fragility of OAM states the conventional wisdom is that turbulence would render OAM-QKD non-viable in a satellite-to-Earth channel. However, based on detailed phase screen simulations of the anticipated atmospheric turbulence we find that OAM-QKD is viable in some system configurations, especially if quantum channel information is utilized in the processing of post-selected states. More specifically, using classically entangled light as a probe of the quantum channel, and reasonably-sized transmitter-receiver apertures, we find that non-zero QKD rates are achievable on sea-level ground stations. Without using classical light probes, OAM-QKD is relegated to high-altitude ground stations with large receiver apertures. Our work represents the first quantitative assessment of the performance of OAM-QKD from satellites, showing under what circumstances the much-touted higher dimensionality of OAM can be utilized in the context of secure communications.
