Dissipative two-level systems under ultrastrong off-resonant driving

Abstract

We study the dissipative dynamics of a two-level system under ultrastrong driving when the frequency and strength of the exciting field exceed significantly the transition frequency. We find three qualitatively different regimes of such dynamics: 1) the collapse and revival of oscillations in the population difference, 2) the simple exponential decay of the oscillations resulting in their steady state with the finite amplitude, and 3) the steady-state stabilization of the equally populated levels. The nonmonotonic Bessel-function-like dependence on the driving strength is also predicted for the decay rate of these oscillations. The features of this dependence are determined by the relative rates of energetic relaxation and pure dephasing.

7 pages, 4 figures

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• Multiphoton Raman transitions and Rabi oscillations in driven spin systems
• Physical background for parameters of the quantum Rabi model
• A Mathematical Analysis of Dressed Photon in Ground State of Generalized Quantum Rabi Model Using Pair Theory
• Probabilistic motional averaging
• Kerr-like nonlinearities in an optomechanical system with an asymmetric anharmonic mechanical resonator
• The possibility of direct observation of the Bloch-Siegert shift in coherent dynamics of multiphoton Raman transitions
• Averaging method and coherence applied to Rabi oscillations in a two-level system
• Emission spectrum of a qubit under its deep strong driving in the high-frequency dispersive regime