From quantum trajectories to classical orbits

The evolution of open quantum systems can be ''unraveled'' into individual ''trajectories'' in a variety of ways. In the mesoscopic regime, quantum jump (QJ) trajectories approach a diffusive limit similar to quantum state diffusion (QSD). In the classical limit, both unravelings show the rise of classical orbits for both regular and chaotic systems. (C) 1997 Published by Elsevier Science B.V.