Decohering histories and open quantum systems

Details Decohering histories and open quantum systems Decohering histories and open quantum systems

2006-11-30

arxiv.org/abs/quant-ph/0611293v2

Journal of Physics: Conference Series 196, 012025 (2009)

Physics

Quantum Physics

References added and discussion slightly modified in Section 3

Scientific paper

10.1088/1742-6596/196/1/012025

I briefly review the ''decohering histories'' or ''consistent histories'' formulation of quantum theory, due to Griffiths, Omnes, and Gell-Mann and Hartle (and the subject of my graduate work with George Sudarshan). I also sift through the many meanings that have been attached to decohering histories, with an emphasis on the most basic one: Decoherence of appropriate histories is needed to establish that quantum mechanics has the correct classical limit. Then I will describe efforts to find physical mechanisms that do this. Since most work has focused on density matrix versions of decoherence, I'll consider the relation between the two formulations, which historically has not been straightforward. Finally, I'll suggest a line of research that would use recent results by Sudarshan to illuminate this aspect of the classical limit of quantum theory.

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