Figure 7
Excited-state probability of a single atom initially prepared in the ground-state and subjected to a polychromatic field with (comb A, left) and without (comb B, right) a resonant component, for different values of the comb aspect ratio ϵ. For combs B, the dynamics display a periodicity of \(2\pi /\delta \omega =2\pi /\epsilon \Omega _{1}\); for combs A, such segments of length \(2\pi /\delta \omega \) do not repeat periodically and it is only if the comb spacing and the resonant component are commensurate, \(\epsilon \equiv \delta \omega /\Omega _{0}=p/q\) that a global periodicity is restored after \(2\pi p/\delta \omega =2\pi q/\Omega _{0}\)