👓 Frauchiger-Renner Paradox Clarifies Where Our Views of Reality Go Wrong | Quanta Magazine

2 thoughts on “👓 Frauchiger-Renner Paradox Clarifies Where Our Views of Reality Go Wrong | Quanta Magazine”

1. Bookmarked Single-world interpretations of quantum theory cannot be self-consistent by Daniela Frauchiger & Renato Renner (arXiv.org)

   According to quantum theory, a measurement may have multiple possible outcomes. Single-world interpretations assert that, nevertheless, only one of them “really” occurs. Here we propose a gedankenexperiment where quantum theory is applied to model an experimenter who herself uses quantum theory. We find that, in such a scenario, no single-world interpretation can be logically consistent. This conclusion extends to deterministic hidden-variable theories, such as Bohmian mechanics, for they impose a single-world interpretation.

   Hat tip: https://boffosocko.com/2019/01/01/frauchiger-renner-paradox-clarifies-where-our-views-of-reality-go-wrong-quanta-magazine/

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2. Bookmarked Quantum theory cannot consistently describe the use of itself by Daniela Frauchiger & Renato Renner (Nature Communications)

   Quantum theory provides an extremely accurate description of fundamental processes in physics. It thus seems likely that the theory is applicable beyond the, mostly microscopic, domain in which it has been tested experimentally. Here, we propose a Gedankenexperiment to investigate the question whether quantum theory can, in principle, have universal validity. The idea is that, if the answer was yes, it must be possible to employ quantum theory to model complex systems that include agents who are themselves using quantum theory. Analysing the experiment under this presumption, we find that one agent, upon observing a particular measurement outcome, must conclude that another agent has predicted the opposite outcome with certainty. The agents’ conclusions, although all derived within quantum theory, are thus inconsistent. This indicates that quantum theory cannot be extrapolated to complex systems, at least not in a straightforward manner.

   Published version of arXiv paper at https://arxiv.org/abs/1604.07422v1
   hat tip: https://boffosocko.com/2019/01/01/frauchiger-renner-paradox-clarifies-where-our-views-of-reality-go-wrong-quanta-magazine/
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• 💬 Chris Aldrich
• 💬 Chris Aldrich

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