English

Probing microscopic models for system-bath interactions via parametric driving

Atomic Physics 2018-07-25 v1 Quantum Physics

Abstract

We show that strong parametric driving of a quantum harmonic oscillator coupled to a thermal bath allows one to distinguish between different microscopic models for the oscillator-bath coupling. We consider a bath with an Ohmic spectral density and a model where the system-bath interaction can be tuned continuously between position and momentum coupling via the coupling angle α\alpha. We derive a master equation for the reduced density operator of the oscillator in Born-Markov approximation and investigate its quasi-steady state as a function of the driving parameters, the temperature of the bath and the coupling angle α\alpha. We find that the time-averaged variance of position and momentum exhibits a strong dependence on these parameters. In particular, we identify parameter regimes that maximise the α\alpha-dependence and provide an intuitive explanation of our results.

Keywords

Cite

@article{arxiv.1803.07785,
  title  = {Probing microscopic models for system-bath interactions via parametric driving},
  author = {Anastasia S. D. Dietrich and Martin Kiffner and Dieter Jaksch},
  journal= {arXiv preprint arXiv:1803.07785},
  year   = {2018}
}

Comments

13 pages, 8 figures

R2 v1 2026-06-23T00:59:54.332Z