连续变量量子通信中的高斯调制

Gaussian-Modulation in Continuous-Variable Quantum Communication

在连续变量量子通信,特别在连续变量量子保密通信中,高斯信源是一个重要的组成部分,它与通信系统的效率、安全性等核心问题有着紧密的联系。利用Shannon信息理论模型,本文研究了高斯信源对量子通信信道容量、量子保密通信安全性等问题的影响,给出了这些重要参数对高斯信源参数的依赖性,并给出了量子保密通信系统的安全性条件。在此基础上提出了一种高斯调制的实验实现方案,利用FPGA成功实现了连续变量量子信号的高斯调制。

The generation of Gaussian source is one of the key elements in continuous-variable quantum communication, especially in continuous-variable quantum cryptography communication, which is closely associated with the core problems of a communication system, such as efficiency, security, etc. bY Using Shannon＇s information-theory model, we studied Gaussian source＇s effect to channel capacity and security of quantum cryptography communication, we then gave these parameters＇ dependence on Gaussian source＇s parameters and the security condition of quantum cryptography communication. Based on all those theoretical analysis, we proposed an experimental method to implement Gaussian-modulation, and used FPGA to generate Gaussian source experimentally.