Nonperturbative interpretation of the Bloch vector's path beyond the rotating-wave approximation

  title={Nonperturbative interpretation of the Bloch vector's path beyond the rotating-wave approximation},
  author={Giuliano Benenti and Stefano Siccardi and Giuliano Strini},
  journal={Physical Review A},
The Bloch vector's path of a two-level system exposed to a monochromatic field exhibits, in the regime of strong coupling, complex corkscrew trajectories. By considering the infinitesimal evolution of the two-level system when the field is treated as a classical object, we show that the Bloch vector's rotation speed oscillates between zero and twice the rotation speed predicted by the rotating wave approximation. Cusps appear when the rotation speed vanishes. We prove analytically that in… Expand
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