Wigner's convoluted friends

Muciño, Ricardo; Okon, Elias

doi:10.1016/j.shpsb.2020.07.001

Cited by 6 publications

(2 citation statements)

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“…In this section, we explore a couple of no-go theorem, on which the previous arguments are motivated. We start by analyzing the no-go theorem by Frauchiger and Renner [14], of which a lot has been written [2,31,32,22,12,33,25]. In their work, Frauchiger and Renner present a result, which they take as proving that "quantum theory cannot consistently describe the use of itself."…”

Section: The Frauchiger-renner and Brukner No-go Theoremsmentioning

confidence: 99%

On the objectivity of measurement outcomes

Okon¹

2021

Preprint

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Recent arguments, involving entangled systems shared by sets of Wigner's friend arrangements, allegedly show that the assumption that the experiments performed by the friends yield definite outcomes, is incompatible with quantum predictions. From this, it is concluded that the results of measurements cannot be thought of as being actual or objective. Here, I show that these arguments depend upon a mistaken assumption, regarding the correlations between the results of the friends and those of "the Wigners," which leads to invalid predictions. It is not, then, that the assumption of definite outcomes leads to trouble, but that the results derived with such an assumption are contrasted with faulty predictions. Next, I explore the more famous no-go theorems by Frauchiger and Renner and by Brukner, on which these recent arguments are motivated. Regarding the first, I show that, although it is cast in a different form, it also rests on the mistaken assumption regarding "mixed" correlations-rendering it invalid. Regarding Brukner's theorem, I point out that it depends on the quite unattractive assumption of locality, a fact that fully diminishes its force. Throughout, I illustrate my claims with explicit calculations within pilot-wave theory.

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Section: The Frauchiger-renner and Brukner No-go Theoremsmentioning

confidence: 99%

On the objectivity of measurement outcomes

Okon¹

2021

Preprint

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“…What comes to much the same thing is the claim that the argument assumes that when an agent in an isolated laboratory performs a measurement, the state collapses inside the laboratory, but not outside. Muciño and Okon [7] argue that, in addition to Q, C and S, Frauchiger and Renner implicitly invoke the assumption:…”

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confidence: 99%

Understanding the Frauchiger–Renner Argument

Bub

2021

Found Phys

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In 2018, Daniela Frauchiger and Renato Renner published an article in Nature Communications entitled 'Quantum theory cannot consistently describe the use of itself.' The argument has been attacked as flawed from a variety of interpretational perspectives. I clarify the significance of the result as a sequence of actions and inferences by agents modeled as quantum systems evolving unitarily at all times. At no point does the argument appeal to a 'collapse' of the quantum state following a measurement.

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