Exciton-polaritons are mixed light-matter quasiparticles. We have developed astatistical model describing stochastic exciton-photon transitions within acondensate of exciton polaritons. We show that the exciton-photon correlatordepends on the "hidden variable" which characterizes the rate of exciton-photontransformations in the condensate. We discuss implications of this effect forthe quantum statistics of photons emitted by polariton lasers.
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