Entanglement enhancement in spatially inhomogeneous many-body systems
  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. 
Tobias Bruenner, Erich Runge, Andreas Buchleitner, Vivian V. Franca
quant-ph cond-mat.quant-gas cond-mat.str-el