论文标题
使用相干状态对卫星到地面量子键分布的大气影响
Atmospheric effects on satellite-to-ground quantum key distribution using coherent states
论文作者
论文摘要
基于卫星的量子密码学已经使用离散可变技术证明了。尽管如此，在连续变量（CV）范式中使用弱相干脉冲执行量子键分布（QKD）仍然非常感兴趣。在这项工作中，我们研究了通过卫星向地通道执行相干状态CV-QKD的可行性。我们使用数值方法来模拟大气湍流并将结果与地面实验数据进行比较，以确认我们方法的有效性。我们发现从数值模拟获得的结果与实验数据非常吻合，并代表了对最新分析模型的改进。然后，使用仿真结果，我们得出QKD密钥速率，并发现在有限的天顶角可以找到有用的非零键率。使用实验验证的低zenith-angle大气通道的模拟来确定QKD密钥速率，这是证明现实世界中卫星至世界CV-QKD的可行性的重要一步。
Satellite-based quantum cryptography has already been demonstrated using discrete variable technology. Nonetheless, there is great interest in using weak coherent pulses to perform quantum key distribution (QKD) in the continuous variable (CV) paradigm. In this work, we study the feasibility of performing coherent-state CV-QKD via the satellite-to-ground channel. We use numerical methods to simulate atmospheric turbulence and compare the results with ground-based experimental data so as to confirm the validity of our approach. We find the results obtained from the numerical simulations agree well with the experimental data and represent an improvement over the state-of-the-art analytical models. Using the simulation results we then derive QKD key rates and find that useful non-zero key rates can be found over a limited range of zenith angles. Determination of QKD key rates using experimentally validated simulations of low-zenith-angle atmospheric channels represents an important step towards proving the feasibility of real-world satellite-to-Earth CV-QKD.
