A simple model of quantum trajectories

Details A simple model of quantum trajectories A simple model of quantum trajectories

2001-08-29

arxiv.org/abs/quant-ph/0108132v1

Am. J. Phys. 70, 719-737 (2002).

Physics

Quantum Physics

42 pages RevTeX including four figures in encapsulated postscript. Submitted to special issue of American Journal of Physics

Scientific paper

10.1119/1.1475328

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. In this paper I present a simple model, using two-level quantum systems (q-bits), 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.

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