Figure 5

Comparison of the optimal intensity of the signal state u between different methods.

The solid line (H₁) refers to our new scheme, the dashed line (H₃) represents the standard three-intensity decoy-state MDI-QKD using HSPS, and the dash-dotted line (W₃) corresponds to the case of using conventional three-intensity decoy-state MDI-QKD using WCS. For simplicity, we set the intensity of the decoy state as v = 0.1 for H₃ and W₃.