摘要
We characterize a modified continuous-variable quantum key distribution(CV-QKD)protocol with four states in the middle of a quantum channel.In this protocol,two noiseless linear amplifiers(NLAs)are inserted before each detector of the two parts,Alice and Bob,with the purpose of increasing the secret key rate and the maximum transmission distance.We present the performance analysis of the new four-state CV-QKD protocol over a Gaussian lossy and noisy channel.The simulation results show that the NLAs with a reasonable gain g can effectively enhance the secret key rate as well as the maximum transmission distance,which is generally satisfied in practice.
We characterize a modified continuous-variable quantum key distribution(CV-QKD)protocol with four states in the middle of a quantum channel.In this protocol,two noiseless linear amplifiers(NLAs) are inserted before each detector of the two parts,Alice and Bob,with the purpose of increasing the secret key rate and the maximum transmission distance.We present the performance anal.ysis of the new four-state CV-QKD protocol over a Gaussian lossy and noisy channel.The simulation results show that the NLAs with a reasonable gain g can effectively enhance the secret key rate as well as the maximum transmission distance,which is generally satisfied in practice.
作者
Yu Mao
Qi Liu
Ying Guo
Hang Zhang
Jian Zhou
毛宇;刘淇;郭迎;张航;周健(School of Automation,Central South University,Changsha 410083;College of Science,Central South University of Forestry and Technology,Changsha 410004;School of Computer Science and Engineering,Central South University,Changsha 410083)
基金
Supported by the National Natural Science Foundation of China under Grant No 61572529
