The authors derive a GHZ-FR paradox from strong contextuality that avoids post-selection and quantum reasoning by modeled observers, unlike the original FR paradox.
The measurement problem is the measurement problem is the measurement problem
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abstract
Recently, it has been stated that single-world interpretations of quantum theory are logically inconsistent. The claim is derived from contradicting statements of agents in a setup combining two Wigner's-friend experiments. Those statements stem from applying the measurement-update rule subjectively, i.e., only for the respective agent's own measurement. We argue that the contradiction expresses the incompatibility of collapse and unitarity - resulting in different formal descriptions of a measurement - and does not allow to dismiss any specific interpretation of quantum theory.
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Subjective collapse views fail in the extended Wigner's friend scenario, but single-world interpretations remain possible if observations are protected from quantum erasure.
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A refined Frauchiger--Renner paradox based on strong contextuality
The authors derive a GHZ-FR paradox from strong contextuality that avoids post-selection and quantum reasoning by modeled observers, unlike the original FR paradox.
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The extended Wigner's friend, many- and single-worlds and reasoning from observation
Subjective collapse views fail in the extended Wigner's friend scenario, but single-world interpretations remain possible if observations are protected from quantum erasure.