For a resonant light-matter coupling, ∆Eℏω c = 0, Ω R (n) = Ω n = 2ℏg c √ n + 1, which scales linearly with the coupling strength g c and the square root of the "photon number" n, providing a simple and intuitive way to consider how a system changes as a function of coupling strength. Fig. depicts the situation for n = 0.