Precision timing via satellite quantum communication

这是一项物理学博士研究项目。精确的定位、导航和计时是一系列现代技术的基础，最著名的是全球定位系统(GPS)。GPS卫星提供的计时精度受到当前铯标准的限制。虽然存在更好的空间部署标准，但它们更大、更复杂，因此也更昂贵。现在已经出现了一些协议，这些协议利用用于量子通信的量子光的时间相关性，使卫星上的时钟保持同步，达到比目前Cs标准更高的精度。该项目将探索纠缠光子卫星有效载荷和地面站之间的双向计时协议。

This is a PhD research project in Physics. Accurate positioning, navigation and timing underpins a range of modern technology, most notably the global positioning system (GPS). The accuracy of timing provided by GPS satellites is limited by current Caesium standards. While better standards for space deployment exist, they are bigger, more complex, and thus far more expensive. Protocols have now emerged which exploit timing correlations in quantum light used for quantum communication to keep clocks on satellites synchronised to an accuracy greater than can be achieved with current Cs standards. This project will explore bi-directional timing protocols between an entangled-photon satellite payload and a ground station.