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Many Worlds?Everett, Quantum Theory, and Reality$
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Simon Saunders, Jonathan Barrett, Adrian Kent, and David Wallace

Print publication date: 2010

Print ISBN-13: 9780199560561

Published to Oxford Scholarship Online: September 2010

DOI: 10.1093/acprof:oso/9780199560561.001.0001

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Quantum Jumps, Born's Rule, and Objective Reality

Quantum Jumps, Born's Rule, and Objective Reality

(p.409) 13 Quantum Jumps, Born's Rule, and Objective Reality
Many Worlds?

Wojciech Hubert Zurek

Oxford University Press

This chapter describes three insights into the transition from quantum to classical that are based on the recognition of the role of the environment. It starts with a minimalist derivation of preferred sets of states. This breaking of the unitary symmetry of the Hilbert space yields — without the usual tools of decoherence — quantum jumps and pointer states consistent with those obtained via einselection. Pointer states obtained this way dene events without appealing to Born's rule for probabilities, which can be now derived from envariance-symmetry of entangled quantum states. With probabilities at hand one can analyze information flows in the course of decoherence. They explain how classical reality can arise from the quantum substrate by accounting for the objective existence of the einselected states of quantum systems through the redundancy of pointer state records in their environment — through quantum Darwinism. Taken together, and in the right order, these three advances (which fit well within Everett's relative states framework, but do not require ‘many worlds’ per se) extend the existential interpretation of quantum theory.

Keywords:   environment, born rule, decoherence, envariance, einselection, pointer state, quantum Darwinism, existential interpretation

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