Classical realization of two-site Fermi-Hubbard systems
  A classical wave optics realization of the two-site Hubbard model, describing the dynamics of interacting fermions in a double-well potential, is proposed based on light transport in evanescently-coupled optical waveguides. 
S. Longhi, G. Della Valle, and V. Foglietti
cond-mat.str-el