发表机构
University of New South Wales（新南威尔士大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对卫星到地面有损信道中的量子设备同步问题，提出偏振辅助协议，实验证明可扩展同步范围并增加40%距离，蒙特卡洛模拟验证其广泛适用性。
AI 中文摘要
由于自发参量下转换产生的纠缠光子对具有紧密的时间耦合特性，它们为改进量子使能设备间的网络同步提供了一条新途径。在新兴的基于空间的量子互联网中，这种同步对运行成功至关重要。在此，我们提出并实验验证了一种新的偏振辅助协议，该协议允许量子使能设备在预计的卫星到地面量子信道的高损耗条件下保持同步。我们的实验结果表明，偏振辅助将可靠的同步获取扩展到更高的信道损耗，并将卫星到地面距离增加高达40%。支持的蒙特卡洛模拟显示，这种性能改进在广泛的光子匮乏条件下均有效。总体而言，这些结果不仅为偏振辅助网络同步提供了概念验证，而且展示了其在显著扩展量子互联网骨干量子使能设备保持高度同步范围方面的实际重要性。
英文摘要
Due to their tight temporal coupling, entangled photon pairs produced by spontaneous parametric down-conversion offer a new route to improved network synchronization among quantum-enabled devices. In the emerging space-based quantum internet, such synchronization will be pivotal to operational success. Here, we propose and experimentally demonstrate a new polarization-assisted protocol that allows quantum-enabled devices to remain synchronized under the high loss conditions anticipated for satellite-to-ground quantum channels. Our experimental results show that polarization assistance extends reliable synchronization acquisition to higher channel losses and an increase of up to 40$\%$ in satellite-to-ground distance. Supporting Monte Carlo simulations show that this performance improvement extends over a wide range of photon-starved conditions. Collectively, these results not only provide a proof of concept for polarization-assisted network synchronization but also demonstrate its pragmatic importance in significantly extending the range under which quantum-enabled devices forming the backbone of the quantum internet can remain highly synchronized.
Comments8 pages, 6 figures
