The original Wigner's friend paradox within a realist toy model

Lostaglio, Matteo; Bowles, Joseph

doi:10.48550/arxiv.2101.11032

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2021

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“…Translating the EWFS into an interferometric setup where the external Observers actions may erase a photon's memory state was considered in [13]. A classical analogy of the EWFS was proposed and studied in [14].…”

Section: Introductionmentioning

confidence: 99%

Extended Wigner's friend problem and the internal consistency of standard quantum mechanics

Sokolovski,

Matzkin

2021

Preprint

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The extended Wigner's friend problem deals with two Observers each measuring a sealed laboratory in which a friend is making a quantum measurement. We investigate this problem by relying on the basic rules of quantum mechanics as exposed by Feynman in the well-known "Feynman Lectures on Physics". Although recent discussions have suggested that the extended Wigner's friend problem cannot consistently be described by quantum theory, we show here that a straightforward application of these standard rules results in a non-ambiguous and consistent account of the measurement outcomes for all agents involved.

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Section: Introductionmentioning

confidence: 99%