非线性效应对多通道量子密钥分发系统的影响

Impact of Nonlinear Effect on the Multichannel Quantum Key Distribution System

多通道量子密钥分发系统具有系统稳定性高、多通道传输、通信容量大等优点,但是非线性效应会降低系统工作性能.文章计算了4阶非线性效应强度,考虑非线性效应研究实验参数对系统性能的影响,利用优化的实验参数抑制非线性效应使系统成码率最大化.这种多通道量子密钥分发系统可以应用于城域量子通信网络.

Multichannel quantum key distribution system has the advantages of the high system stability,multichannel transmission,and large capacity.But nonlinear effect may reduce the system performance.In this paper we derive the intensity of fourth-order nonlinear effect theoretically.We analyze the impact of experimental parameters on the system performance considering the nonlinear effect.The nonlinear effect is suppressed by use of the optimal experimental parameters in order to maximize the system key generation rate.The multichannel quantum key distribution system is suitable for metropolitan area quantum communication network.