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

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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.
Original languageEnglish
Pages (from-to)658-669
Number of pages12
JournalFoundations of Physics
Issue number5
Early online date7 Apr 2017
Publication statusPublished - May 2017

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