A full understanding of open quantum systems requires the characterization of both system and environmental properties. However, the complexity of the environmental statistics in the presence of strong system-bath hybridization and long memory effects usually prevents effective non-perturbative methods from going beyond the analysis of the reduced system dynamics. Here we present a model consisting of purified auxiliary bosonic modes to describe, alongside properties of the system, the dynamics of environmental observables for bosonic baths prepared in non-Gaussian initial states. We numerically exemplify this method by simulating non-Markovian multi-photon transfer processes on a coupled cavity waveguide system in the large time delay regime.
@article{arxiv.2412.04264,
title = {A purified input-output pseudomode model for structured open quantum systems},
author = {Pengfei Liang and Neill Lambert and Si Luo and Lingzhen Guo and Mauro Cirio},
journal= {arXiv preprint arXiv:2412.04264},
year = {2024}
}