K. Hornberger and J. E. Sipe,

Collisional decoherence reexamined,

Phys. Rev. A

Abstract:

We rederive the quantum master equation for the decoherence of a massive Brownian particle due to collisions with the lighter particles from a thermal environment. Our careful treatment avoids the occurrence of squares of Dirac delta functions. It leads to a decoherence rate which is smaller by a factor of 2π compared to previous findings. This result, which is in agreement with recent experiments, is confirmed by both a physical analysis of the problem and by a perturbative calculation in the weak coupling limit.

(16 pages, 4 figures) [ps, pdf, journal] (c) The American Physical Society