Dynamics of a quantum two-level system under the action of phase-diffusion field

作者：Sobakinskaya E A; Pankratov A L^*; Vaks V L

来源：Physics Letters A, 2012, 376(4): 265-269.

DOI：10.1016/j.physleta.2011.10.047

• Two-level system
• Absorption spectrum
• Relaxation
• Phase-diffusing field
• Nonstationary spectroscopy
• Stochastic field

We study a behavior of quantum two-level system, interacting with noisy phase-diffusion field. The dynamics is shown to split into two regimes, determined by the coherence time of the phase-diffusion field. For both regimes we present a model of quantum system behavior and discuss possible applications of the obtained effect for spectroscopy. In particular, the obtained analytical formula for the macroscopic polarization demonstrates that the phase-diffusion field does not affect the absorption line shape, which opens up an intriguing possibility of noisy spectroscopy, based on broadband sources with Lorentzian line shape.

• 出版日期2012-1-9