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Making Mistakes Saves the Single Observer’s World of the Extended Wigner’s Friend Experiment
Łukaszyk Patent Attorneys, Katowice, Poland
- 1 Łukaszyk Patent Attorneys, Katowice, Poland
Journal of Quantum Information Science·Volume 12 (2022)·Pages 1–12·Published 22 February 2022·DOI10.4236/jqis.2022.121001
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Abstract
The Extended Wigner’s Friend thought experiment, comprising a quantum system containing an agent who draws conclusions upon observing the outcome of a measurement of a quantum state prepared in two nonorthogonal versions by another agent, led its authors to conclude that quantum theory cannot consistently describe the use of itself. It has also been proposed that this thought experiment is equivalent to entangled state (Bell-type) experiments. It is argued in this paper that the assumption of the freedom of choice of the first Wigner’s friend regarding how to prepare a quantum state in one of the two available nonorthogonal versions invalidates such equivalence.
KeywordsMeasurement ProblemWigner’s FriendBell’s TheoremObserver-Independent FactsQuantum ContextualityFreedom of Choice
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