The dynamics of the entanglement for a solid polariton system is investigated. The polariton system is a photon-phonon complex and its time-dependent characteristic function in the Wigner representation for the system is obtained analytically. It is found that when the photon field is initially prepared in the squeezed vacuum state, and the phonon in the thermal state, the polariton system can evolve into a two-mode Gaussian mixed state. The entanglement between photon and phonon turns out to be apparently dependent on the squeezing parameter and exhibits a critical behavior with respect to the temperature. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200703.67.Mn Entanglement production, characterization and manipulation, -71.36+c Polaritons (including photon-phonon and photon-magnon interactions),
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