Exciton-photon correlations in bosonic condensates of exciton-polaritons
  Exciton-polaritons are mixed light-matter quasiparticles. We have developed a statistical model describing stochastic exciton-photon transitions within a condensate of exciton polaritons. We show that the exciton-photon correlator depends on the "hidden variable" which characterizes the rate of exciton-photon transformations in the condensate. We discuss implications of this effect for the quantum statistics of photons emitted by polariton lasers. 
A.V. Kavokin, A.S. Sheremet, I.A. Shelykh, P.G. Lagoudakis, and Y.G.   Rubo
cond-mat.mes-hall