When Greenberger, Horne and Zeilinger meet Wigner's Friend
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A general argument is presented against relativistic, unitary, single-outcome quantum mechanics. This is achieved by combining the Wigner's Friend thought experiment with measurements on a Greenberger-Horne-Zeilinger (GHZ) state, and describing the evolution of the quantum state in various inertial frames. Assuming unitary quantum mechanics and single outcomes, the result is that the Born rule must be violated in some inertial frame: in that frame, outcomes are obtained for which no corresponding term exists in the pre-measurement wavefunction.
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Forward citations
Cited by 2 Pith papers
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Wavefunctions localization, and the Wigner's Friend Paradox in a Framework of Discrete-Space Hypothesis
Wavefunction localization emerges dynamically from the Schrödinger equation on R x Q_p, allowing independent definite readings for Wigner and his friend as classical apparatuses and consistency with extended no-go the...
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What Do Black Holes Teach Us About Wigner's Friend?
Black hole paradoxes favor Wigner's Friend responses that posit intrinsic relationality and retrocausality.
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