Quantummechanical model for continuous position measurements
Abstract
We present an idealized model for a sequence of position measurements, and we then take an appropriate limit in which the measurements become continuous. The measurements lead to fluctuations without systematic dissipation, and they rapidly destroy offdiagonal terms in the position basis; thus the pointer basis is position. A modification of the model incorporates systematic dissipation via a feedback mechanism; in the modified model there is no decay of offdiagonal coherence in the position basis.
 Publication:

Physical Review A
 Pub Date:
 December 1987
 DOI:
 10.1103/PhysRevA.36.5543
 Bibcode:
 1987PhRvA..36.5543C
 Keywords:

 Continuum Modeling;
 Equations Of Motion;
 Position (Location);
 Quantum Mechanics;
 Schroedinger Equation;
 Dirac Equation;
 Free Molecular Flow;
 Gauss Equation;
 Langevin Formula;
 Physics (General);
 03.65.Bz