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29 March 2024
 
  » arxiv » 2005.8577

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Bell Nonlocality and the Reality of Quantum Wavefunction
Anandamay Das Bhowmik ; Preeti Parashar ; Manik Banik ;
Date 18 May 2020
AbstractThe seminal Pusey-Barrett-Rudolph theorem establishes quantum wavefunction as a state of reality rather than the mere information about the system. The theorem, however, draws criticism due to a less justifiable assumption, namely ’preparation independence’, used in its derivation. In this work we propose a new $psi$-ontology theorem by invoking a completely different assumption which we call ’no ontic retro-causality’. We provide a rationale for this new assumption and discuss novelty of the present $psi$-ontology theorem over the existing ones. At the core of our derivation we utilize another influential no-go result by John S. Bell that rules out any {it local realistic} world view for quantum theory. More particularly, we show that Bell nonlocality excludes a class of ontological explanations for quantum theory where quantum wavefunction is treated as mere information, viz. $psi$-epistemic explanations. Furthermore, the degree of quantum nonlocality puts nontrivial limit on the degree of epistemicity.
Source arXiv, 2005.8577
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