Resonant modification of the Rabi oscillations of a two-level system

Strong field effects in the evolution of a two-level system

“…When the field amplitude increases and reaches the value f ε ∼ 1 one can observe the resonant retuning of the Rabi oscillations Fig. 4B that was qualitatively described in [14]. The amplitude of these oscillations with the field frequency becomes comparable with the Rabi oscillation amplitude, so that the collapse-revival effect is suppressed.…”

“…In particular, even for relatively small f but in a strong field, the parameter that defines the ratio of the Rabi frequency Ω to the field frequency ω, ξ = Ω ω = 2 f √ n 0 can be quite large [12]. It was shown in many papers that the numerical analysis of the experiments in this case should be fulfilled beyond the RWA [13][14][15]. In the case when n 0 1 the field is usually considered as a classical one, but the influence of quantum effects and the validity of the RWA on the description of the evolution in this limit are not fully analysed, and a set of experimental results still does not have the theoretical explanation [12].…”

Transformation of a Rabi oscillation spectrum for a two-level system in a strong resonant field

“…With an increase in field amplitude and attainment of the values fε ~ 1, resonant modification of the Rabi oscillations occurs, (Fig. 3b), which was qualitatively described in [13]. The amplitude of the oscillations at the field frequency becomes comparable with the amplitude of the Rabi oscillations, and the "collapse×revival" effect is suppressed.…”

“…The dimensionless coupling constant f between the system and the field as well as the average number of photons n 0 in the resonant mode vary over a very broad range [8][9][10]. In particular, even for relatively small f but in strong fields, the parameter defining the ratio of the Rabi frequency Ω to the field frequency ω, ξ = Ω ⁄ ω ≈ 2f√ ⎯⎯ n 0 , can be rather large [11] and, as has been shown in many papers, for quantitative analysis of experiments in this area, we need to go beyond the rotating wave approximation (see, for example, [12][13][14]). In the case n 0 >> 1, the field is usually considered as classical, but the influence of quantum effects and the possibility of using the rotating wave approximation when describing the evolution in such a limit have not been sufficiently completely studied.…”

Parity breaking and scaling behavior in light-matter interaction

“…This could be understood physically from whether the energy level crossing happens or not. But the deeper physics is the different parity behaviors in both models, which yield different dynamics [7]. Second, for ǫ = 0, only energy avoided-crossing occurs in either of the models (See Appendix B).…”