2020
DOI: 10.1038/s41567-020-0990-x
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A strong no-go theorem on the Wigner’s friend paradox

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Cited by 126 publications
(328 citation statements)
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“…If measurement truly collapses a wave function and this results in a recorded fact, then objectivity is guaranteed by the collapse. If instead measurement passes the observer (and his lab) into a superposed state, then experiments such as [11] and [12] begin to seem to question objective reality, while our thought experiment recognizes the actual problem is how to maintain consistency in the complex superposition so that observers or viewers who may encounter each other are in possession of compatible facts. One could in principle hypothesize this directly which essentially was Everett's approach, but instead we have used a hypothesis very similar to some versions of the measurement hypothesis, deliberately so.…”
Section: When Does Quantum Reality Emerge?mentioning
confidence: 93%
See 3 more Smart Citations
“…If measurement truly collapses a wave function and this results in a recorded fact, then objectivity is guaranteed by the collapse. If instead measurement passes the observer (and his lab) into a superposed state, then experiments such as [11] and [12] begin to seem to question objective reality, while our thought experiment recognizes the actual problem is how to maintain consistency in the complex superposition so that observers or viewers who may encounter each other are in possession of compatible facts. One could in principle hypothesize this directly which essentially was Everett's approach, but instead we have used a hypothesis very similar to some versions of the measurement hypothesis, deliberately so.…”
Section: When Does Quantum Reality Emerge?mentioning
confidence: 93%
“…This roughly replaces consideration #3 in the above list. "Absoluteness" in the sense of [12] is too strong a term for us, since we consider superobservers unable to discuss specific results as not in the same world line as the observers in their experiments. If superpositions exist in the experiment, a world line is an objectively consistent state which is an element of the supeposition.…”
Section: Introductionmentioning
confidence: 98%
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“…The paper by Cavalcanti "The View from a Wigner Bubble," then runs with this new Copernican principle to conclude that the outcomes an agent obtains upon a making quantum measurements cannot be considered absolute events in a single spacetime. Differing from usual QBist-style argumentation, his argument is instead based on another recent no-go theorem on the Wigner's friend paradox [18]. The technique is significant in that one does not have be a full-blown QBist to end up at one of QBism's key tenets-the tenet that quantum measurement outcomes must be understood as personal to the agent performing the measurement.…”
mentioning
confidence: 99%