Polariton quantum optics and quantum collective phenomena: Overview and perspectives

The author will present an overview of the physics of polaritons, focusing on their quantum many-body properties. In particular, the author will illustrate recent results in two main areas: polariton Bose-Einstein condensation, and the controlled generation of quantum correlated polariton states. In particular, the author will discuss the physics of polaritons as a two-component interacting Bose gas and will illustrate the theoretical approach to the polariton condensate, predicting the phase diagram and the collective excitation spectrum.