小卫星QKD下行链路性能：QuantSat-PT实例研究
LEO small satellite QKD downlink performance: QuantSat-PT case study
摘要：
在这项工作中，我们建模和仿真的量子密钥分发（QKD）下行链路从低地球轨道（LEO）的小卫星的光学地面站（OGS）的性能，作为QuantSat-PT任务的概念和初步设计阶段的组成部分。通过详细建模和模拟下行链路传输信道的影响，重点是湍流和大气的BB84和E91协议的损失，我们找到了一组一致的值的性能包线，解决了模糊的任务实验数据，已报告之前这项工作。我们得到的4状态BB84协议的筛选的密钥速率和量子误码率（QBER）的32.1 kbit/s和$4\%$，分别为天顶在750公里的轨道。对于E91方案，进行了Clauser、Horne、Shimony和Holt（CHSH）检验，得出任务的相关系数为$S \in[-2.63\pm0.02,-1.91\pm0.03]$。这些结果与最先进的模拟器和实验卫星基于量子密钥分配的相关性的状态的一致性进行了讨论。
英文摘要：
In this work, we model and simulate the performance of a quantum key distribution (QKD) downlink from a low earth orbit (LEO) small satellite to an optical ground station (OGS), as integral part of the concept and preliminary design phase of the QuantSat-PT mission. By modelling and simulating in detail downlink transmission channel effects, with emphasis on turbulent and atmospheric losses for BB84 and E91 protocols, we find a consistent set of values for the performance envelope that resolves ambiguities of mission experimental data that had been reported previous to this work. We obtain for the 4-state BB84 protocol a sifted key rate and Quantum Bit Error Rate (QBER) of 32.1 kbit/s and $4\%$, respectively, for zenith at 750 km orbit. For the E91 protocol the Clauser, Horne, Shimony and Holt (CHSH) test was performed resulting in a correlation factor of $S \in[-2.63\pm0.02,-1.91\pm0.03]$ for the mission. The consistency of these results with the state of the art simulators and its relevance on experimental satellite based QKD is discussed.
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