Polariton laser and OPO in micropillar cavities

Semiconductor microcavities in the strong coupling regime have been the subject of intensive research efforts these last years. In this system, the eigenstates are exciton-photon entangled states (named cavity polaritons). Polaritons present strong non-linearities due to their excitonic part and obey to bosonic statistics, thus being able to massively occupy a single quantum state (quantum degeneracy). The paper discusses the potentiality of cavity polaritons for the realization of a low threshold source of coherent light, and for the generation of quantum correlated photons.