利用具有星间链路的卫星星座构建全球量子互联网
Building a global quantum internet using a satellite constellation with inter-satellite links
AI总结：
提出通过带星间激光链路的近地轨道卫星星座及无源光学下行链路构建全球量子互联网，可在美欧亚间实现数MHz纠缠分发并降低对量子存储器与中继器的依赖。
摘要：
量子互联网是一个用于分发纠缠并传输量子信息的全球网络，在网络安全、量子计算和量子传感领域具有应用。在此，我们提出利用配备星间激光链路的近地轨道卫星星座构建量子互联网。我们的方案基于光子传输的下行链路模型，其中卫星搭载纠缠光子源和/或配备镜面中继系统，以在太空中重新引导光子路径。我们表明，利用以10 GHz速率产生光子对的多路复用纠缠光子源，在美国、欧洲和亚洲之间实现数MHz的纠缠分发速率是可能的。我们的方案证明了无源光学器件在实现基于卫星的量子互联网方面的重要性，这降低了对量子存储器和中继器技术的依赖。
英文摘要：
The quantum internet is a global network to distribute entanglement and communicate quantum information with applications in cybersecurity, quantum computing, and quantum sensing. Here, we propose building a quantum internet using a constellation of low-Earth-orbit satellites equipped with inter-satellite laser links. Our proposal is based on the downlink model of photon transmission, where satellites carry entangled photon sources and/or have a mirror relay system to redirect the photon path in space. We show that few MHz entanglement distribution rates are possible between the US, Europe, and Asia, with a multiplexed entangled-photon source generating pairs at 10 GHz. Our proposal demonstrates the importance of passive optics in realizing a satellite-based quantum internet, which reduces dependency on quantum memory and repeater technologies.
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