A purified input-output pseudomode model for structured open quantum systems

TL;DR

This paper introduces a purified input-output pseudomode model that effectively characterizes complex environmental effects in open quantum systems, especially with non-Gaussian initial states, enabling better simulation of non-Markovian dynamics.

Contribution

The authors develop a novel model using purified auxiliary bosonic modes to describe environmental observables in non-Gaussian states, advancing non-perturbative analysis of open quantum systems.

Findings

Successfully simulates non-Markovian multi-photon transfer processes

Handles non-Gaussian initial states of the environment

Provides a framework for analyzing complex system-environment interactions

Abstract

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.