A simple model of quantum trajectories
Abstract
Quantum trajectory theory, developed largely in the quantum optics community to describe open quantum systems subjected to continuous monitoring, has applications in many areas of quantum physics. I present a simple model, using twolevel quantum systems (qbits), to illustrate the essential physics of quantum trajectories and how different monitoring schemes correspond to different "unravelings" of a mixed state master equation. I also comment briefly on the relationship of the theory to the consistent histories formalism and to spontaneous collapse models.
 Publication:

American Journal of Physics
 Pub Date:
 July 2002
 DOI:
 10.1119/1.1475328
 arXiv:
 arXiv:quantph/0108132
 Bibcode:
 2002AmJPh..70..719B
 Keywords:

 01.50.i;
 42.50.p;
 03.65.Ta;
 Educational aids;
 Quantum optics;
 Foundations of quantum mechanics;
 measurement theory;
 Quantum Physics
 EPrint:
 42 pages RevTeX including four figures in encapsulated postscript. Submitted to special issue of American Journal of Physics