Entanglement enhancement in spatially inhomogeneous many-body systems

TL;DR

This paper explores how spatial inhomogeneities can significantly enhance entanglement in strongly correlated Fermi-Hubbard chains, offering a new perspective contrary to previous findings of entanglement destruction.

Contribution

It demonstrates that inhomogeneities can enhance entanglement in many-body systems and provides a general method using Density Functional Theory for predicting this effect in nanostructures.

Findings

Entanglement can be enhanced by up to ~24% due to inhomogeneities.

Contrasts previous reports of entanglement destruction in similar systems.

Provides a general recipe for predicting entanglement enhancement in nanostructures.

Abstract

We investigate the effects of spatial inhomogeneities on the entanglement of modes of strongly correlated systems in the framework of small Fermi-Hubbard chains. We find regimes where entanglement is strongly enhanced by the presence of inhomogeneities. This contrasts recent reports of entanglement destruction due to inhomogeneities. We further study this phenomenon using concepts of Density Functional Theory and, thus, provide a general recipe for the prediction of entanglement enhancement in nanostructures. We find enhancement of up to ~24%, as compared to impurity-free chains.