On the Quantum Measurement Problem

Author(s)
Caslav Brukner
Abstract

In this paper, I attempt a personal account of my understanding of the measurement problem in quantum mechanics, which has been largely in the tradition of the Copenhagen interpretation. I assume that (i) the quantum state is a representation of knowledge of a (real or hypothetical) observer relative to her experimental capabilities; (ii) measurements have definite outcomes in the sense that only one outcome occurs; (iii) quantum theory is universal and the irreversibility of the measurement process is only "for all practical purposes". These assumptions are analyzed within quantum theory and their consistency is tested in Deutsch's version of the Wigner's friend gedanken experiment, where the friend reveals to Wigner whether she observes a definite outcome without revealing which outcome she observes. The view that holds the coexistence of the "facts of the world" common both for Wigner and his friend runs into the problem of the hidden variable program. The solution lies in understanding that "facts" can only exist relative to the observer.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW)
Pages
95-117
No. of pages
23
DOI
https://doi.org/10.1007/978-3-319-38987-5_5
Publication date
2017
Peer reviewed
Yes
Austrian Fields of Science 2012
103025 Quantum mechanics
Keywords
ASJC Scopus subject areas
Philosophy, Arts and Humanities (miscellaneous), History and Philosophy of Science, Social Sciences (miscellaneous), Sociology and Political Science
Portal url
https://ucrisportal.univie.ac.at/en/publications/on-the-quantum-measurement-problem(a1fcd6bb-d0dc-436a-a3bb-3491aba2bd06).html