Evolution of Fock states in three mixed harmonic oscillators: quantum   statistics
  In this communication we investigate the quantum statistics of three harmonic oscillators mutually interacting with each other considering the modes are initially in Fock states. After solving the equations of motion, the squeezing phenomenon, sub-Poissonian statistics and quasiprobability functions are discussed. We demonstrate that the interaction is able to produce squeezing of different types. We show also that certain types of Fock states can evolve in this interaction into thermal state and squeezed thermal state governed by the interaction parameters. 
Faisal A. A. El-Orany, J. Perina and M. Sebawe Abdalla
quant-ph