Related papers: Bell Nonlocality and the Reality of Quantum Wavefunction

Bell Nonlocality and the Reality of Quantum Wavefunction

URL: http://arxiv.org/abs/2005.08577v4
Date: Thu, 22 Jul 2021 09:27:09 GMT
Title: Bell Nonlocality and the Reality of Quantum Wavefunction
Authors: Anandamay Das Bhowmik, Preeti Parashar, and Manik Banik
Abstract summary: Status of quantum wavefunction is one of the most debated issues in quantum foundations. We show that the observed phenomenon of quantum nonlocality cannot be incorporated in a class of $psi$-epistemic models.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Status of quantum wavefunction is one of the most debated issues in quantum foundations -- whether it corresponds directly to the reality or just represents knowledge or information about some aspect of reality. In this letter we propose a {\it $\psi$-ontology} theorem that excludes a class of ontological explanations where quantum wavefunction is treated as mere information. Our result, unlike the acclaimed Pusey-Barrett-Rudolph's theorem, does not presume the absence of holistic ontological properties for product quantum preparations. At the core of our derivation we utilize the seminal no-go result by John S. Bell that rules out any local realistic world view for quantum theory. We show that the observed phenomenon of quantum nonlocality cannot be incorporated in a class of $\psi$-epistemic models. Using the well known Clauser-Horne-Shimony-Holt inequality we obtain a threshold bound on the degree of epistemicity above which the ontological models are not compatible with quantum statistics.

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