Balancing four-state continuous-variable quantum key distribution with linear optics cloning machine

Wu Xiao-Dong¹, Liao Qin¹, Huang Duan^{1, 2, †}, Wu Xiang-Hua¹, Guo Ying^{1, 3, ‡}

(color online) Comparison of the performance between the four-state protocol based on LOCM operation and the standard four-state protocol with parameters λ = 0.3 and τ = {0.2,0.4,0.6}.