Figure 2

The logarithmic negativity EN as a function of the normalized detuning Δ/ωm with four different optical coupling strength J at a fixed temperature T = 400 mK and the other parameters are given in Table 1.

The logarithmic negativity EN as a function of the normalized detuning Δ/ωm with four different optical coupling strength J at a fixed temperature T = 400 mK and the other parameters are given in Table 1.