This paper presents a no-go theorem demonstrating that within the framework of seemingly natural quantum mechanical assumptions, a single observer's perceptions of their measurement outcomes at different times cannot share the same reality in a Wigner's friend scenario. This implies that either the Born rule needs nonlinear modification for two-time predictions, the predictive power of quantum theory must be reduced by prohibiting the use of present information to predict the future, or unitary quantum mechanics' validity for single-time predictions for all observers must be denied. The paper discusses which assumptions are most likely to be dropped in various interpretations of quantum mechanics.
Publisher
Communications Physics
Published On
May 13, 2021
Authors
Philippe Allard Guérin, Veronika Baumann, Flavio Del Santo, Časlav Brukner
Tags
quantum mechanics
Wigner's friend
no-go theorem
Born rule
unitary quantum mechanics
measurement outcomes
reality
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