The original Wigner's-Friend scenarios

Published 16 Sep 2025 in quant-ph | (2509.13470v1)

Abstract: We describe the Wigner's-Friend scenario according to Wigner, then a similar but earlier version according to Everett. Wigner and Everett provide different resolutions of essentially the same paradox. Decoherence theory provides a third resolution. Despite different interpretations (or their absence), these three stories fit together to form a consistent picture without a paradox.

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Jay Lawrence

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