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arXiv 2209.15071quant-phgr-qc
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基于卫星纠缠光子源的全球时间分布

Global Time Distribution via Satellite-Based Sources of Entangled Photons

Stav Haldar, Ivan Agullo, Anthony J. Brady, Antía Lamas-Linares, W. Cyrus Proctor, James E. Troupe

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20 pages, 12 figures and 6 tables. Comments are welcome
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摘要：

我们提出了一个基于卫星的方案，利用量子资源在全球各地的地面站之间进行时钟同步。我们称之为量子时钟同步（QCS）网络。通过详细的数值模拟，我们评估的可行性和能力，该计划的近期实施。我们考虑一个小型的纳米卫星星座，只配备了适度的资源。这些包括诸如自发参量下转换（SPDC）源、雪崩光电探测器（APD）之类的量子器件，以及诸如芯片级原子钟（CSAC）之类的中等稳定的板上时钟。在我们的模拟中，描述硬件的各种性能参数已经被选择，使得它们要么已经商业化，要么只需要适度的进步。我们的结论是，这样一个计划建立一个全球网络的地面时钟同步到亚纳秒级（高达几皮秒）的精度，将是可行的。这样的QCS卫星星座将构成未来量子网络的基础设施，能够作为全球可访问的纠缠资源。与此同时，我们的时钟同步协议提供了许多量子网络协议所需的亚纳秒级同步，因此，可以被视为为空间域中的量子技术增加了一层额外的实用性。

英文摘要：

We propose a satellite-based scheme to perform clock synchronization between ground stations spread across the globe using quantum resources. We refer to this as a quantum clock synchronization (QCS) network. Through detailed numerical simulations, we assess the feasibility and capabilities of a near-term implementation of this scheme. We consider a small constellation of nanosatellites equipped only with modest resources. These include quantum devices such as spontaneous parametric down conversion (SPDC) sources, avalanche photo-detectors (APDs), and moderately stable on-board clocks such as chip scale atomic clocks (CSACs). In our simulations, the various performance parameters describing the hardware have been chosen such that they are either already commercially available, or require only moderate advances. We conclude that with such a scheme establishing a global network of ground based clocks synchronized to sub-nanosecond level (up to a few picoseconds) of precision, would be feasible. Such QCS satellite constellations would form the infrastructure for a future quantum network, able to serve as a globally accessible entanglement resource. At the same time, our clock synchronization protocol, provides the sub-nanosecond level synchronization required for many quantum networking protocols, and thus, can be seen as adding an extra layer of utility to quantum technologies in the space domain designed for other purposes.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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