Quantifying non-Markovianity for a chromophore-qubit pair in a super-Ohmic bath

TL;DR

This paper investigates how temperature and coupling strength influence non-Markovian dynamics of a chromophore-qubit system in a super-Ohmic bath using a non-Markovian master equation approach.

Contribution

It introduces a measure of non-Markovianity based on dynamical fixed points and analyzes environmental effects on system dynamics.

Findings

Higher temperature reduces non-Markovianity.

Weak coupling increases non-Markovianity with coupling strength.

Strong coupling reverses this trend.

Abstract

An approach based on a non-Markovian time-convolutionless polaron master equation is used to probe the quantum dynamics of a chromophore-qubit in a super-Ohmic bath. Utilizing a measure of non-Markovianity based on dynamical fixed points, we study the effects of the environment temperature and the coupling strength on the non-Markovian behavior of the chromophore in a super-Ohmic bath. It is found that an increase in the temperature results in a reduction in the backflow information from the environment to the chromophore, and therefore, a suppression of non-Markovianity. In the weak coupling regime, increasing coupling strength will enhance the non- Markovianity, while the effect is reversed in the strong coupling regime.