AI 中文总结
研究基于空间的量子密钥分发协议中量子信道特性，在实际假设下表征变化的信道损耗及损耗源，表明特定信道参数下受限假设可生成正密钥。
AI 中文摘要
在基于空间的量子密钥分发（QKD）协议中，量子信道本质上是动态的，信道损耗随天顶角变化。在连续变量（CV）-QKD中，这会导致参数估计问题，尤其是传输的本地振荡器会使散粒噪声波动。因此，表征这种信道损耗及其损耗源至关重要。本文在实际假设下表征了变化的信道损耗，并针对各种不同场景、湍流强度和波长进行了展示。这项工作表明，对于所考虑的信道参数，如果做出受限的伊芙安全假设，就有可能生成正的秘密密钥。
英文摘要
In space based quantum key distribution (QKD) protocols, the quantum channel will be dynamic in nature and the channel loss will change with respect to the zenith angle. In the context of continuous variable (CV)-QKD, this will cause issues with parameter estimation and for a transmitted local oscillator in particular it will also fluctuate the shot noise. Therefore, it is vital to characterise this channel loss and the sources of this loss. In this paper the varying channel loss is characterised under practical assumptions. This is shown for various different scenarios, turbulence strengths, as well as wavelengths. This work shows, for the channel parameters considered, it is possible to generate a positive secret key if restricted Eve security assumptions are made.
Comments19 pages, 9 figures
