Comment on Healey's "Quantum Theory and the Limits of Objectivity"

Author(s)
Veronika Baumann, Flavio Del Santo, Caslav Brukner
Abstract

In this comment we critically review an argument against the existence of objective physical outcomes, recently proposed by Healey [1]. We show that his gedankenexperiment, based on a combination of Wigner's friend scenarios and Bell's inequalities, suffers from the main criticism, that the computed correlation functions entering the Bell's inequality are in principle experimentally inaccessible, and hence the author's claim is in principle not testable. We discuss perspectives for fixing that by adapting the proposed protocol and show that this, however, makes Healey's argument virtually equivalent to other previous, similar proposals that he explicitly criticises.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
Università della Svizzera Italiana, Österreichische Akademie der Wissenschaften (ÖAW)
Journal
Foundations of Physics
Volume
49
Pages
741-749
No. of pages
9
ISSN
0015-9018
DOI
https://doi.org/10.1007/s10701-019-00276-w
Publication date
07-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
103025 Quantum mechanics, 103010 History of physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/comment-on-healeys-quantum-theory-and-the-limits-of-objectivity(2e1f248c-1687-46a1-bfd0-0fb9ea8c4604).html