A. Kowalski et al., DISSIPATIVE BEHAVIOR AND THE INTERFACE BETWEEN QUANTUM AND CLASSICAL DYNAMICAL-SYSTEMS, Chaos, solitons and fractals, 6, 1995, pp. 255-265
We consider the interaction between a two level system and a classical
harmonic oscillator. The dynamical evolution is described via a conve
nient generalization of Ehrenfest' s theorem, which leads to a set of
Bloch-like equations. This model is able to mimic a dissipating tempor
al evolution, without violating any quantum rule.