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Single-world theory of the extended Wigner's friend experiment

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JournalFoundations of Physics
DateAccepted/In press - 17 Mar 2017
DateE-pub ahead of print - 7 Apr 2017
DatePublished (current) - May 2017
Issue number5
Number of pages12
Pages (from-to)658-669
Early online date7/04/17
Original languageEnglish


Frauchiger and Renner have recently claimed to prove that ``Single-world interpretations of quantum theory cannot be self-consistent". This is contradicted by a construction due to Bell, inspired by Bohmian mechanics, which shows that any quantum system can be modelled in such a way that there is only one ``world" at any time, but the predictions of quantum theory are reproduced. This Bell-Bohmian theory is applied to the experiment proposed by Frauchiger and Renner, and their argument is critically examined. It is concluded that it is their version of ``standard quantum theory", incorporating state vector collapse upon measurement, that is not self-consistent.

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© The Author(s) 2017.

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