Pseudomode description of general open quantum system dynamics: non-perturbative master equation for the spin-boson model

• URL: http://arxiv.org/abs/2108.05755v1
• Date: Thu, 12 Aug 2021 13:49:22 GMT
• Title: Pseudomode description of general open quantum system dynamics: non-perturbative master equation for the spin-boson model
• Authors: Graeme Pleasance and Francesco Petruccione
• Abstract summary: We outline a non-perturbative approach for simulating the behavior of open quantum systems interacting with a bosonic environment. Our framework can be used as a powerful and versatile tool for analyzing non-Markovian open system dynamics.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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