The quantum-to-classical transition and decoherence

Abstract

I give a pedagogical overview of decoherence and its role in providing a dynamical account of the quantum-to-classical transition. The formalism and concepts of decoherence theory are reviewed, followed by a survey of master equations and decoherence models. I also discuss methods for mitigating decoherence in quantum information processing and describe selected experimental investigations of decoherence processes.

22 pages, 3 figures. v2: comment added regarding complete positivity of Lindblad evolution. Please see my arXiv:1911.06282 [quant-ph] (published as Phys. Rep. 831, 1-57, 2019) for a much more extensive and up-to-date review of decoherence

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