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Entanglement, decoherence, and measurement

Hobson, Art (2019) Entanglement, decoherence, and measurement. [Preprint]

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Abstract

The fully entangled Schrodinger cat state obtained immediately upon measurement of a superposed two state quantum system by a detector is often said to paradoxically predict macroscopically different outcomes simultaneously. However, nonlocal interferometry experiments and their accompanying quantum theoretical analyses, testing momentum entangled photon pairs over the full range of phases, demonstrate that the cat state does not fit this description. This state instead represents two nonlocally coherent correlations between its subsystems. Even if the detector is a cat, this state is not paradoxical. Furthermore, standard quantum theory correctly predicts the experimentally observed nonparadoxical outcomes. Thus both quantum theory and quantum experiments show there is no Schrodinger cat paradox associated with measurement. This resolves the problem of definite outcomes and, with it, the measurement problem. Upon entanglement with a detector, superpositions collapse nonlocally and unitarily to one definite macroscopic outcome. No special collapse postulate is needed.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Hobson, Artahobson@uark.edu
Keywords: entanglement, decoherence, measurement, non-locality, Schrodinger's cat
Subjects: Specific Sciences > Physics > Quantum Mechanics
Depositing User: Dr. Art Hobson
Date Deposited: 11 Apr 2019 22:27
Last Modified: 11 Apr 2019 22:27
Item ID: 15893
Subjects: Specific Sciences > Physics > Quantum Mechanics
Date: 10 April 2019
URI: http://philsci-archive.pitt.edu/id/eprint/15893

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