First observation of the quantized exciton-polariton field and effect of interactions on a single polariton - Cuevas, Alvaro; Lopez Carreno, Juan Camilo; Silva, Blanca; De Giorgi, Milena; Suarez-Forero, Daniel G; Munoz, Carlos Sanchez; Fieramosca, Antonio; Cardano, Filippo; Marrucci, Lorenzo; Tasco, Vittorianna; Biasiol, Giorgio; del Valle, Elena; et al. (Science Advances, 2018)