Four-State Modulation in Middle of a Quantum Channel for Continuous-Variable Quantum Key Distribution Protocol with Noiseless Linear Amplifier
Yu Mao1, Qi Liu2, Ying Guo3, Hang Zhang1, Jian Zhou3**
1School of Automation, Central South University, Changsha 410083 2College of Science, Central South University of Forestry and Technology, Changsha 410004 3School of Computer Science and Engineering, Central South University, Changsha 410083
Abstract：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.
(Optical implementations of quantum information processing and transfer)
引用本文:
. [J]. 中国物理快报, 2019, 36(10): 100302-.
Yu Mao, Qi Liu, Ying Guo, Hang Zhang, Jian Zhou. Four-State Modulation in Middle of a Quantum Channel for Continuous-Variable Quantum Key Distribution Protocol with Noiseless Linear Amplifier. Chin. Phys. Lett., 2019, 36(10): 100302-.
2019, Vol. 36 
