An Approximate Solution of the Jaynes-Cummings Model with Dissipation
  In this paper we treat the Jaynes-Cummings model with dissipation and give an approximate solution to the master equation for the density operator {\bf under the general setting} by making use of the Zassenhaus expansion. 
Kazuyuki Fujii (Yokohama City University) and Tatsuo Suzuki (Shibaura   Institute of Technology)
quant-ph math-ph math.MP