Entanglement in the Process of Stimulated Brillouin Scattering of Light
  The process of stimulated Brillouin scattering is described by the model of two-dimensional oscillator. The phenomenon of entanglement which appears in the photon-phonon modes after the interaction with matter is discussed. 
S. V. Kuznetsov, A. V. Kyusev, O. V. Man'ko, N. V. Tcherniega