基于光前置放大器的量子密钥分发融合经典通信方案

量子密钥分发融合经典通信方案将连续变量量子密钥分发和经典通信合并到了一起,为将来在现有的光网络上同时进行密钥分发和经典通信提供了一个有效的方法.然而,在量子信号上叠加一个经典信号将会给连续变量量子密钥分发系统引入过噪声从而大大降低系统的性能.本文提出基于光前置放大器的量子密钥分发融合经典通信方案,即在接收端插入光前置放...

Optical preamplifier based simultaneous quantum key distribution and classical communication scheme

That the simultaneous quantum key distribution and classical communication(SQCC)scheme are combined with the continuous variable quantum key distribution(CVQKD)and the classical communication together,will provide an effective method to implement the simultaneous CVQKD and the classical communication in the existing optical networks in the future.However,superimposing a classical signal on the quantum signal will introduce excess noise into the CVQKD system,thus greatly reducing the performance of the system.In this paper,a novel scheme of SQCC based on optical preamplifier(OPA)is proposed,that is,the OPA is inserted into the receiver to improve the performance of the system.On the one hand,under the condition of the same bit error rate,the amplification of the signal by the OPA can reduce the requirement for the modulation amplitude of the classical signal at the sending end,thereby reducing the noise effect of the classical signal on the quantum signal.On the other hand,the OPA can compensate for the imperfection of the receiver detector.Moreover,in the case of locally generated local oscillator,the amplifier can also amplify the weak phase reference pulse,and thus reducing the phase excess noise caused by the shot noise of the weak phase reference pulse.Numerical simulation results show that the proposed scheme has better performance than the original scheme in the sense of security key rate and transmission distance.These results show that this scheme provides an effective and practical method for the further development and practical application of the SQCC scheme.