Journal
PHYSICS LETTERS A
Volume 336, Issue 1, Pages 16-24Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2004.12.065
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We show a completely analytical approach to the decoherence induced by a zero temperature environment on a Brownian test particle. We consider an Ohmic environment bilinearly coupled to an oscillator and compute the master equation. From diffusive coefficients, we evaluate the decoherence time for the usual quantum Brownian motion and also for an upside-down oscillator, as a toy model of a quantum phase transition. (C) 2004 Elsevier B.V. All rights reserved.
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