Decoherence in a Two-Particle Model

Details Decoherence in a Two-Particle Model Decoherence in a Two-Particle Model

2002-10-30

arxiv.org/abs/quant-ph/0210199v1

Physics

Quantum Physics

24 pages, Latex

Scientific paper

We consider a simple one dimensional quantum system consisting of a heavy and a light particle interacting via a point interaction. The initial state is chosen to be a product state, with the heavy particle described by a coherent superposition of two spatially separated wave packets with opposite momentum and the light particle localized in the region between the two wave packets. We characterize the asymptotic dynamics of the system in the limit of small mass ratio, with an explicit control of the error. We derive the corresponding reduced density matrix for the heavy particle and explicitly compute the (partial) decoherence effect for the heavy particle induced by the presence of the light one for a particular set up of the parameters.

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