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Protective Measurements and the Reality of the Wave Function

Gao, Shan (2020) Protective Measurements and the Reality of the Wave Function. The British Journal for the Philosophy of Science. ISSN 1464-3537

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Abstract

It has been debated whether protective measurement implies the reality of the wave function. In this paper, I present a new analysis of the relationship between protective measurements and the reality of the wave function. First, I briefly introduce protective measurements and the ontological models framework for them. Second, I give a simple proof of Hardy's theorem in terms of protective measurements. Third, I analyze two suggested psi-epistemic models of a protective measurement. It is shown that although these models can explain the appearance of expectation values of observables in a single measurement, their predictions about the variance of the result of a non-ideal protective measurement are different from those of quantum mechanics. Finally, I argue that under an auxiliary finiteness assumption about the dynamics of the ontic state, protective measurement implies the reality of the wave function in the ontological models framework.


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Item Type: Published Article or Volume
Creators:
CreatorsEmailORCID
Gao, Shansgao7319@uni.sydney.edu.au
Keywords: protective measurement; wave function; psi-epistemic models; psi-ontic view
Subjects: Specific Sciences > Physics > Quantum Mechanics
General Issues > Realism/Anti-realism
Depositing User: Prof. Shan Gao
Date Deposited: 26 Jan 2020 02:12
Last Modified: 26 Jan 2020 02:12
Item ID: 16850
Journal or Publication Title: The British Journal for the Philosophy of Science
Official URL: https://academic.oup.com/bjps/advance-article-abst...
DOI or Unique Handle: https://doi.org/10.1093/bjps/axaa004
Subjects: Specific Sciences > Physics > Quantum Mechanics
General Issues > Realism/Anti-realism
Date: 24 January 2020
ISSN: 1464-3537
URI: https://philsci-archive-dev.library.pitt.edu/id/eprint/16850

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