Copenhagenish interpretations of quantum mechanics

• URL: http://arxiv.org/abs/2506.00112v2
• Date: Thu, 24 Jul 2025 22:59:06 GMT
• Title: Copenhagenish interpretations of quantum mechanics
• Authors: David Schmid, Yìlè Yīng, Matthew Leifer,
• Abstract summary: We define a class of Copenhagenish interpretations encompassing modern interpretations that follow the Copenhagen spirit.<n>These interpretations are characterized by four postulates: Observers Observe, Universality, Anti-$psi$-ontology, and Completeness.<n>We discuss what lessons are implied for Copenhagenish interpretations by the measurement problem, the Wigner's friend thought experiment, and the simple variants of the Wigner's friend thought experiment.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We define a class of Copenhagenish interpretations encompassing modern interpretations that follow the Copenhagen spirit. These interpretations are characterized by four postulates: Observers Observe, Universality, Anti-$\psi$-ontology, and Completeness. We explain why such interpretations are not equivalent to the textbook (or orthodox) interpretation, nor to the view that one should shut up and calculate, nor to strict operationalism. We then discuss what lessons are implied for Copenhagenish interpretations by the measurement problem, the Wigner's friend thought experiment, and the simple variants of the Wigner's friend thought experiment that we term Wigner's enemy, stalkee, and penpal. In particular, we discuss how Copenhagenish interpretations give multiple distinct descriptions of each experiment, where these descriptions are each individually true, yet cannot be combined into any single description. To make such interpretations consistent, then, one requires epistemological constraints forbidding certain perspectives from being combined. We discuss these constraints, their motivations, and some of the challenges they introduce.

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