On the Ollivier-Poulin-Zurek definition of objectivity

Details On the Ollivier-Poulin-Zurek definition of objectivity On the Ollivier-Poulin-Zurek definition of objectivity

2011-02-14

arxiv.org/abs/1102.2826v2

Physics

Quantum Physics

15 pages; significant revision of text; main results unchanged

Scientific paper

The Ollivier-Poulin-Zurek definition of objectivity provides a philosophical basis for the environment as witness formulation of decoherence theory and hence for quantum Darwinism. It is shown that no account of the reference of the key terms in this definition can be given that does not render the definition either inapplicable in practice or circular. It is argued that this is not the fault of the language used, but of the assumption that the laws of physics are independent of Hilbert-space decomposition. All evidence suggests that this latter assumption is true. If it is, decoherence cannot explain the emergence of classicality.

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