Quantum mutual entropy for Jaynes-Cummings model
  The dynamics of an atom on the Jaynes-Cummings model has been studied by an atomic inversion, von Neumann entropy and so on. In this letter, we will treat the Jaynes-Cummings model as a problem in non-equilibrium statistical mechanics and apply quantum mutual entropy to study the irreversible dynamics of a state for the atom on this model. 
Shigeru Furuichi, Masanori Ohya and Hiroki Suyari