Collisional decoherence reexamined

Details Collisional decoherence reexamined Collisional decoherence reexamined

2003-03-14

arxiv.org/abs/quant-ph/0303094v2

Phys. Rev. A 68, 012105 (2003)

Physics

Quantum Physics

33 pages, 4 figures

Scientific paper

10.1103/PhysRevA.68.012105

We re-derive 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 2 pi 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.

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