Quantum Theory of the Classical: Einselection, Envariance, Quantum Darwinism and Extantons

Abstract

Core quantum postulates including the superposition principle and the unitarity of evolutions are natural and strikingly simple. I show that -- when supplemented with a limited version of predictability (captured in the textbook accounts by the repeatability postulate) -- these core postulates can account for all the symptoms of classicality. In particular, both objective classical reality and elusive information about reality arise, via quantum Darwinism, from the quantum substrate.

arXiv commentTo appear in the ENTROPY volume "Quantum Darinism and Friends" edited by Sebastian Deffner et al. https://www.mdpi.com/journal/entropy/special_issues/quantum_darwinism. arXiv admin note: text overlap with arXiv:0707.2832

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