Entanglement distribution has been accomplished using a flying drone, and this mobile platform can be generalized for multiple mobile nodes with optical relay among them. Here we develop the first optical relay to reshape the wave front of photons for their low diffraction loss in free-space transmission. Using two drones, where one distributes the entangled photons and the other serves as relay node, we achieve entanglement distribution with Clauser-Horne-Shimony-Holt $S$ parameter of $2.59\pm 0.11$ at 1 km distance. Key components for entangled source, tracking, and relay are developed with high performance and are lightweight, constructing a scalable airborne system for multinode connectio and toward mobile quantum networks.

中文翻译：

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使用无人机作为移动节点的光中继纠缠分布

纠缠分配已使用飞行无人机完成，并且该移动平台可以推广到多个移动节点，其中有光中继。在这里，我们开发了第一个光学继电器，以重整光子的波阵面，以降低其在自由空间传输中的衍射损耗。使用两架无人机，其中一架散布纠缠的光子，另一架充当中继节点，我们通过Clauser-Horne-Shimony-Holt实现缠结分布$\mathrm{小号}$ 的参数 $2.59\pm 0.11$1公里的距离。纠缠源，跟踪和中继的关键组件以高性能开发且轻巧，为多节点连接和移动量子网络构建了可扩展的机载系统。