Decoherence and the (non)emergence of classicality

Details Decoherence and the (non)emergence of classicality Decoherence and the (non)emergence of classicality

2008-07-22

arxiv.org/abs/0807.3376v2

Physics

Quantum Physics

Changed to emphasize the role of stability as a criterion for classicality, rather than diagonalization of the reduced density

Scientific paper

We consider the claim that decoherence explains the emergence of classicality in quantum systems, and conclude that it does not. We show that, given a randomly chosen universe composed of a variety of subsystems, some of which are macroscopic and subject to decoherence-inducing interactions, and some of which are microscopic, the macroscopic subsystems will not display any distinctively classical behavior. Therefore, a universe in which macroscopic and microscopic do display distinct behavior must be in a very special, highly nongeneric quantum state.

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