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Methodological notes


Wigner's friend paradox: does objective reality not exist?

† 
Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation

It is shown that the lack of objective existence of the results of quantum measurements of the state of collapse of the state vector of a remote localized system cannot be proved by an experiment using the reality of violation of Bell's inequality in the Clauser—Horne—Shimony—Holt form. Arguments of a general nature and a specific calculation example confirming this conclusion are also given.

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Fulltext is also available at DOI: 10.3367/UFNe.2020.05.038767
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Keywords: Wigner's friend paradox, quantum nondemolition measurements, Bell's inequality, Clauser—Horne—Shimony—Holt inequality, quantum state vector, von Neumann projection postulate, no-communication theorem
PACS: 03.65.Ud, 42.65.Lm (all)
DOI: 10.3367/UFNe.2020.05.038767
URL: https://ufn.ru/en/articles/2020/12/d/
000621721400004
2-s2.0-85102651233
2020PhyU...63.1256B
Citation: Belinsky A V "Wigner's friend paradox: does objective reality not exist?" Phys. Usp. 63 1256–1263 (2020)
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Received: 1st, March 2020, revised: 28th, March 2020, 15th, May 2020

Оригинал: Белинский А В «Парадокс друга Вигнера: объективной реальности не существует?» УФН 190 1335–1342 (2020); DOI: 10.3367/UFNr.2020.05.038767

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