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) Relation between the differential noise and two parameters λ, τ. We can obtain easily and then derive by selecting appropriate parameters λ and τ.