Pseudomode description of general open quantum system dynamics: non-perturbative master equation for the spin-boson model
Abstract
We outline a non-perturbative approach for simulating the behavior of open quantum systems interacting with a bosonic environment defined by a generalized spectral density function. The method is based on replacing the environment by a set of damped harmonic oscillators - the pseudomodes - thereby forming an enlarged open system whose dynamics is governed by a Markovian master equation. Each pseudomode is connected to one of the poles of the spectral density when analytically continued to the lower-half complex frequency plane. Here, we extend previous results to a completely generic class of open system models, and discuss how our framework can be used as a powerful and versatile tool for analyzing non-Markovian open system dynamics. The effectiveness of the method is demonstrated on the spin-boson model by accurately benchmarking its predictions against numerically exact results.
Cite
@article{arxiv.2108.05755,
title = {Pseudomode description of general open quantum system dynamics: non-perturbative master equation for the spin-boson model},
author = {Graeme Pleasance and Francesco Petruccione},
journal= {arXiv preprint arXiv:2108.05755},
year = {2021}
}
Comments
6+3 pages, 2 figures