Communications Physics (May 2021)

A no-go theorem for the persistent reality of Wigner’s friend’s perception

  • Philippe Allard Guérin,
  • Veronika Baumann,
  • Flavio Del Santo,
  • Časlav Brukner

DOI
https://doi.org/10.1038/s42005-021-00589-1
Journal volume & issue
Vol. 4, no. 1
pp. 1 – 7

Abstract

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Wigner’s friend is a thought experiment in theoretical quantum physics that challenges our understanding of quantum theory. The authors present a no-go theorem constraining the structure of probabilities in such a thought experiment and analyze the validity of the three particular assumptions according to various interpretations of quantum mechanics.