论文标题
卫星到地面连续变量量子密钥分布：低地球轨道中的高斯和离散调制协议
Satellite-to-Ground Continuous Variable Quantum Key Distribution: The Gaussian and Discrete Modulated Protocols in Low Earth Orbit
论文作者
论文摘要
高斯调制的连续变量量子键分布（GM-CVKD）协议已知，以最大程度地提高量子密钥分布（QKD）的两方之间的共同信息。替代调制方案是离散调制的CVQKD（DM-CVQKD）协议。在本文中，我们研究了低SNR策略中的卫星链路上的相移键合（M-PSK）和正交振幅调制（M QAM）DM-CVKD协议以及GM-CVKD协议。我们使用卫星到地面链路模型，该模型分别考虑了几何损失，闪烁和分别从连接距离，大气湍流和大气气溶胶的散射损失。此外，最近的多维（MD）以及多级编码和多阶段解码（MLC-MSD）对帐方法模型与多种型低密度平价 - 检查（MET-LDPC）代码模型结合使用，以确定和解效率。结果表明，GM-CVQKD的表现优于DM-CVKD。此外，具有MD核对的GM-CVQKD通过在较大的链路距离和较低的高程角度产生积极的秘密密钥速率，超过了MLC-MSD对帐的GM-CVKD。
The Gaussian modulated continuous variable quantum key distribution (GM-CVQKD) protocol is known to maximise the mutual information between two parties during quantum key distribution (QKD). An alternative modulation scheme is the discrete modulated CVQKD (DM-CVQKD) protocol. In this paper, we study the Phase Shift Keying (M-PSK) and Quadrature Amplitude Modulation (M QAM) DM-CVQKD protocols along with the GM-CVQKD protocol over a satellite-to-ground link in the low SNR regime. We use a satellite-to-ground link model which takes into account geometric losses, scintillation, and scattering losses from the link distance, atmospheric turbulence, and atmospheric aerosols, respectively. In addition, recent multidimensional (MD) and multilevel coding and multistage decoding (MLC-MSD) reconciliation method models in combination with multiedge-type low-density parity-check (MET-LDPC) code models have been used to determine the reconciliation efficiency. The results show that GM-CVQKD outperforms DM-CVQKD. In addition, GM-CVQKD with MD reconciliation outperforms GM-CVQKD with MLC-MSD reconciliation in the finite size limit by producing positive secret key rates at larger link distances and lower elevation angles.
