Non-Markovian decoherence of a two-level system in a Lorentzian bosonic
reservoir and a stochastic environment with finite correlation time
- URL: http://arxiv.org/abs/2006.14055v2
- Date: Thu, 2 Jul 2020 13:44:25 GMT
- Title: Non-Markovian decoherence of a two-level system in a Lorentzian bosonic
reservoir and a stochastic environment with finite correlation time
- Authors: V. A. Mikhailov, N. V. Troshkin
- Abstract summary: We investigate non-Markovian evolution of a two-level system (qubit) in a bosonic bath under influence of an external classical environment.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In this paper we investigate non-Markovian evolution of a two-level system
(qubit) in a bosonic bath under influence of an external classical fluctuating
environment. The interaction with the bath has the Lorentzian spectral density,
and the fluctuating environment (stochastic field) is represented by a set of
Ornstein-Uhlenbeck processes. Each of the subenvironments of the composite
environment is able to induce non-Markovian dynamics of the two-level system.
By means of the numerically exact method of hierarchical equations of motion,
we study dependence of the steady states of the two-level system, the reduced
density matrix evolution and the equilibrium emission spectrums on frequency
cutoffs and coupling strengths of the subenvironments. Additionally we
investigate the impact of the rotation-wave approximation (RWA) used for the
interaction with the bath on accuracy of the results.
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