Entanglement and entangling power of the dynamics in light-harvesting complexes

TL;DR

This paper investigates how quantum entanglement evolves in the FMO complex during photosynthesis, analyzing the effects of different noise types and excitation methods on entanglement generation and transfer efficiency.

Contribution

It provides a comprehensive analysis of entanglement dynamics in the FMO complex under various noise conditions and excitation mechanisms, highlighting the complex interplay influencing energy transfer.

Findings

Entanglement varies with noise type and excitation method.

Near-unit energy transfer efficiency occurs despite intermediate entanglement levels.

Natural conditions optimize the entangling power of the FMO complex.

Abstract

We study the evolution of quantum entanglement during exciton energy transfer (EET) in a network model of the Fenna-Matthews-Olson (FMO) complex, a biological pigment-protein complex involved in the early steps of photosynthesis in sulphur bacteria. The influence of Markovian, as well as spatially and temporally correlated (non-Markovian) noise on the generation of entanglement across distinct chromophores (site entanglement) and different excitonic eigenstates (mode entanglement) is studied for different injection mechanisms, including thermal and coherent laser excitation. Additionally, we study the entangling power of the FMO complex under natural operating conditions. While quantum information processing tends to favor maximal entanglement, near unit EET is achieved as the result of an intricate interplay between coherent and noisy processes where the initial part of the evolution displays intermediate values of both forms of entanglement.