Fig. 3

a–c This graphic is the same as Fig. 2, but for the case that the chosen squeezing parameters are \(\mu =\sqrt {2}\) and ν=−1 which give a p-squeezed state at initial time. From the fact that the overall graphics in this case are not so much different from the corresponding ones of Fig. 2, we can confirm that the evolution of γ_G(t) is nearly irrelevant to the types of squeezing so long as the absolute values of μ and ν do not change