Fig. 1. Shannon entropy and minimum entropy versus α. (a) (c) β=π/2; (b) (d) β=0

Fig. 2. Shannon entropy and minimum entropy versus β when θ=π/4, α=π/4, and t=60. (a) Shannon entropy; (b) minimum entropy

Fig. 3. Shannon entropy and minimum entropy versus number of evolution steps when α=π/4 and β=π/2. (a) Shannon entropy; (b) minimum entropy