标题： 探索大气约束下的卫星量子密钥分发 显示英文标题

标题： Exploring Satellite Quantum Key Distribution under Atmospheric Constraints

摘要： 卫星量子密钥分发为安全的全球通信提供了一条具有无与伦比安全性的路径。 然而，地面到卫星的量子密钥分发链路由于大气湍流而受到降级。 本文提供了一个数值框架，使用角谱传播、Hufnagel-Valley湍流模型和Von Karman相位屏，并考虑了由于光束被大气中的不同元素和化合物（如O2、CO2和H2O）吸收而引入的静态损耗。 此仿真逐步将高斯光束通过大气传播，在此过程中利用基于标准Cn2剖面的相位屏来包含相位畸变，这些相位畸变考虑了闪烁和光束漂移等损耗。 我们模拟了带有诱饵态的BB84协议以增强安全性。 仿真的结果量化了在不同距离范围内的预期链路预算和安全密钥速率，以衡量自由空间光学量子密钥分发链路在不同距离下的可行性。 显示英文摘要

摘要： Satellite Quantum Key Distribution creates a pathway for secure global communication with a level of security that is peerless. However, ground-to-satellite Quantum Key Distribution links are degraded due to the atmospheric turbulence. This paper gives a numerical framework using angular spectrum propagation, Hufnagel-Valley model of turbulence and Von Karman phase screens and takes into account the static losses introduced due to the absorption of the beam by the different elements and compounds in the atmosphere like O2, CO2 and H2O. This simulation propagates a Gaussian beam step by step through the atmosphere, where we incorporate the phase distortions using phase screens based on standard Cn2 profiles which take into account losses such as scintillation and beam wander. We simulate the BB84 protocol with decoy states for added security. The results of the simulation quantify the expected link budget and Secure key rates over a range of distances to measure the viability of Free Space Optical Quantum Key Distribution links at different distances.