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Feasibility assessment for practical continuous variable quantum key distribution over the satellite-to-Earth channel

机译：可行性评估实际的连续变量量子密钥分发的satellite-to-Earth通道

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摘要

Currently, quantum key distribution (QKD) using continuous variable (CV) technology has only been demonstrated over short-range terrestrial links. Here, we attempt to answer whether CV-QKD over the much longer satellite-to-Earth channel is feasible. To this end, we first review the concepts and technologies that will enable CV-QKD over the satellite-to-Earth channels. We then consider, in the infinite key limit, the simplest-to-deploy QKD protocols, the coherent state (CS) QKD protocol with homodyne detection and the CS-QKD protocol with heterodyne detection. We then focus on the CS-QKD protocol with heterodyne detection in the pragmatic setting of finite keys, where complete security against general attacks is known. We pay particular attention to the relevant noise terms in the satellite-to-Earth channel and their impact on the secret key rates. In system set-ups where diffraction dominates losses, we find that the main components of the total excess noise are the intensity fluctuations due to scintillation, and the time-of-arrival fluctuations between signal and local oscillator. We conclude that for a wide range of pragmatic system models, CS-QKD with information-theoretic security in the satellite-to-Earth channel is feasible.
机译：目前,量子密钥分发(QKD)使用连续变量(CV)技术只有证明在短程陆地链接。在这里,我们试图回答是否CV-QKD结束更长的satellite-to-Earth通道可行的。将使CV-QKD的概念和技术在satellite-to-Earth频道。考虑,在无限的关键限制simplest-to-deploy QKD协议,连贯状态(CS) QKD协议与零差检测并与外差CS-QKD协议检测。外差检测的务实有限的键的设置,完成安全普通攻击。特别注意相关噪声在satellite-to-Earth通道和他们对密钥率的影响。衍射损失占主导地位,我们发现的主要组件总过剩噪声由于闪烁强度波动,到场时间之间的波动信号和本地振荡器。广泛的实用系统模型,CS-QKD信息理论安全satellite-to-Earth通道是可行的。

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