Exact Solution of a Master Equation Applied to the Two Level System of   an Atom
  In this paper we discuss a master equation applied to the two level system of an atom and derive an exact solution to it in an abstract manner. We also present a problem and a conjecture based on the three level system. Our results may give a small hint to understand the huge transition from Quantum World to Classical World.   To the best of our knowledge this is the finest method up to the present. 
Kazuyuki Fujii (YCU)
quant-ph math-ph math.MP