A systematic study of the role of dissipative environment in regulating entanglement and exciton delocalization in the Fenna-Matthews-Olson complex

TL;DR

This study systematically investigates how different environmental factors affect entanglement and exciton coherence in the FMO complex, revealing that entanglement depends on system-environment interaction strength and temperature, while coherence length remains unaffected by non-Markovianity.

Contribution

It provides a comprehensive analysis of environmental influences on quantum properties in the FMO complex using an exact numerical method, highlighting key factors affecting entanglement and coherence.

Findings

Entanglement is mainly driven by system-environment interaction strength.

Coherence length is insensitive to non-Markovian effects.

No direct correlation between entanglement and energy transfer efficiency.

Abstract

In this Article we perform a systematic study of the global entanglement and exciton coherence length dynamics coherence in natural light-harvesting system Fenna-Matthews-Olson (FMO) complex across various parameters of a dissipative environment from low to high temperatures, weak to strong system-environment coupling, and non-Markovian environments. A non-perturbative numerically exact hierarchical equations of motions method is employed to propagate the dynamics of the system. We found that entanglement is driven primarily by the strength of interaction between the system and environment, and it is modulated by the interplay between temperature and non-Markovianity. In contrast, coherence length is found to be insensitive to non-Markovianity. Furthermore, our results do not show the direct correlation between global entanglement and the efficiency of the excitation energy transfer in the FMO complex