Modelling and experimental testing of an optical synchronisation beacon designed for high-loss satellite quantum communication
Modelling and experimental testing of an optical synchronisation beacon designed for high-loss satellite quantum communication
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用于高损耗卫星量子通信的光同步信标的建模和实验测试
DOI：
10.1049/qtc2.12071
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发表时间：
2023
影响因子：
--
通讯作者：
Zhang P
中科院分区：
文献类型：
--
作者：
Zhang P
基于CubeSats的长距离自由空间量子密钥分发可用于建立全球量子安全通信网络，其设计和发射的低成本使其潜在的商业应用受益。探测从太空发出的单光子级光脉冲需要高度精确和强大的定时系统来从噪声中挑选出信号。对于这样的高损耗应用，我们设想低重复（sub-MHz）信标激光器发射短（ns）高峰值功率脉冲，从中可以导出内插量子信号到达窗口。我们首先从理论上研究了抖动对量子信号门控效率的影响，包括所有重要的抖动源，然后通过改变时钟抖动进行了实验研究，结果表明抖动越大，信号的门控率越低。在实验室条件下对实验插值误差进行了测试，结果接近我们的模型。我们还发现，由多普勒效应引入的抖动可以被忽略的重复率大于1 kHz。该模型可直接用于在陆地自由空间或光纤上使用类似同步方案的所有量子和非量子系统的性能分析和优化。
Long‐distance free space quantum key distribution based on CubeSats can be used to establish global quantum secure communication networks, with potential commercial applications benefitting from the low cost of its design and launch. Detecting single‐photon level optical pulses sent from space requires highly accurate and robust timing systems to pick out signals from the noise. For such high‐loss applications, we envisage a low‐repetition (sub‐MHz) beacon laser emitting short (ns) high‐peak‐power pulses from which interpolated quantum signal arrival windows can be derived. We firstly study theoretically the effects of jitter on the efficiency of gating quantum signals including all important jitter sources, and then experimentally investigated it by changing the clock jitter, and the result shows that the greater jitter will reduce the gating rate of the signal. The experimental interpolation error is tested against loss under laboratory conditions giving results close to our model. We also found that the jitter introduced by the Doppler effect can be ignored with a repetition rate larger than 1 kHz. This model can be directly used for the performance analysis and optimisation of all quantum and non‐quantum systems using similar synchronisation schemes over terrestrial free space or fibre.
时间和空间抖动对带有 DF 中继的 FSO 链路性能的影响以及湍流信道上的 OC 分集
影响因子：
2.4
作者：
P. J. Gripeos;H. Nistazakis;A. Tsigopoulos;V. Christofilakis;E. Roditi
通讯作者：
E. Roditi