PT spectroscopy of the Rabi problem

@article{Joglekar2014PTSO,
  title={PT spectroscopy of the Rabi problem},
  author={Yogesh N. Joglekar and Rahul Marathe and P. Durganandini and Rajeev K Pathak},
  journal={Physical Review A},
  year={2014},
  volume={90},
  pages={040101}
}
We investigate the effects of a time-periodic, non-hermitian, PT-symmetric perturbation on a system with two (or few) levels, and obtain its phase diagram as a function of the perturbation strength and frequency. We demonstrate that when the perturbation frequency is close to one of the system resonances, even a vanishingly small perturbation leads to PT symmetry breaking. We also find a restored PT-symmetric phase at high frequencies, and at moderate perturbation strengths, we find multiple… 

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