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K. Hornberger
Introduction to decoherence theory,
Lect. Notes Phys. 768, 221-276 (2009)

First paragraph:

This introduction to the theory of decoherence is aimed at readers with an interest in the science of quantum information. In that field, one is usually content with simple, abstract descriptions of non-unitary "quantum channels" to account for imperfections in quantum processing tasks. However, in order to justify such models of non-unitary evolution and to understand their limits of applicability it is important to know their physical basis. I will therefore emphasize the dynamic and microscopic origins of the phenomenon of decoherence, and will relate it to concepts from quantum information where applicable, in particular to the theory of quantum measurement.

(56 pages, 2 figures)   [pdf, journal, arXiv ]

doi:10.1007/978-3-540-88169-8_5            (c) Springer-Verlag Berlin Heidelberg 2009