  We demonstrate the potential of quantum operation using lattices of
exciton-polaritons in patterned semiconductor microcavities. By introducing an
inverse four-wave mixing scheme acting on localized modes, we show that it is
possible to develop non-classical correlations between individual condensates.
This allows a concept of quantum exciton-polariton networks, characterized by
the appearance of multimode entanglement even in the presence of realistic
levels of dissipation.
