Figure 1
From: Qubit-flip-induced cavity mode squeezing in the strong dispersive regime of the quantum Rabi model
Comparison between a numerical solution of the lowest energy levels of the full quantum Rabi model [Eq. (1)] (points) and the analytical solutions of the dispersive Hamiltonian [Eq.(4)] (solid) for (a) g/ω = 0.1 and (b) g/ω = 0.2. Note that Ω/ω = 1 + Δ/ω. Our choice to intentionally leave out the point Δ = 0 is based on the fact that the dispersive approximation breaks down at Δ = 0. It is, therefore, only meaningful to compare the predictions of the full quantum Rabi model and the dispersive theory away from Δ = 0.
