Improving Parameter Optimization in Decoy-State Quantum Key Distribution

Figure 4

Illustration of our method for optimization in the seven-intensity protocol. The objective is to find the optimal Alice’s decoy intensity and Bob’s decoy intensity . The red points represent successive solutions in each generation. (a) In the 1st generation, possible solutions are overlaid at all search spaces. (b) and (c) Fitter solutions are extracted through selection and genetic operators. (d) After 50 generations, the algorithm is stopped at a point very close to the optima.

(a)

(b)

(c)

(d)