Boson-boson pure-dephasing model with non-Markovian properties

TL;DR

This paper introduces a new exactly solvable boson-boson pure-dephasing model that exhibits non-Markovian dynamics, providing fresh insights into decoherence in high-dimensional open quantum systems.

Contribution

It proposes a novel bosonic model for pure-dephasing that is fully solvable and demonstrates non-Markovian behavior, expanding understanding beyond traditional spin-boson models.

Findings

Model reproduces pure-dephasing processes similar to spin-boson models

Exhibits non-Markovian dynamics under various measures

Offers a new perspective on decoherence in high-dimensional systems

Abstract

Understanding decoherence processes is crucial in the study of open quantum systems. In this paper, we discuss the mechanism of pure-dephasing process with a newly proposed boson-boson model, namely, a bosonic field coupled to another bosonic bath in thermal equilibrium. Our model is fully solvable and can reproduce the pure-dephasing process which is usually described by the well-known spin-boson model, therefore offering a new perspective to understanding decoherence processes in open quantum systems of high dimension. We also show that this model admits a generically non-Markovian dynamics with respect to various different non-Markovian measures.