Figure 12

The final mean phonon number \(n_{f}^{i}\) and quantum synchronization \(S_{c}\) as a function of the frequency of the rf resonator \(\omega _{\mathrm{lc}}\) (a) without the voltage modulation (\(\eta =0\)) and (b) with the voltage modulation (\(\eta =1\)). The pink shaded region signifies the ground state cooling for \(N<1\). The other parameters are the same as in Fig. 3