Figure 6

Nonlinearity of the driven Duffing potential. Top: the nonlinearity measures \(\eta_{{ \mathrm{B}} } [{V} ]\) (red line) and \(\eta_{ { \mathrm{N G}} } [{V} ]\) (blue line) for the driven oscillator as a function of ε and for the choice of parameters \(\mathcal{ F}=0.015\), \(t=1\) and \(\omega=1.018\) which ensures that the resonator is in the bistability region. The inset is a parametric plot of \(\eta_{{ \mathrm{B}} }\) as a function of \(\eta_{ { \mathrm{N G}} }\), showing that the two measures are monotone functions of each other. The bottom panel shows the Wigner function for the same set of parameters and \(\varepsilon=0.1\).