An approximate solution of the jaynescummings model with dissipation II:

In the preceding paper (arXiv: 1103.0329 [quant-ph]) we treated the JaynesCummings model with dissipation and gave an approximate solution to the master equation for the density operator under the general setting by making use of the Zassenhaus expansion. However, to obtain a compact form of the approximate solution (which is in general complicated infinite series) is very hard when an initial condition is given. To overcome this difficulty we develop another approach and obtain a compact approximate solution when some initial condition is given.