The unspeakable why

Abstract

For years, the biggest unspeakable in quantum theory has been why quantum theory and what is quantum theory telling us about the world. Recent efforts are unveiling a surprisingly simple answer. Here we show that two characteristic limits of quantum theory, the maximum violations of Clauser-Horne-Shimony-Holt and Klyachko-Can-Binicioğlu-Shumovsky inequalities, are enforced by a simple principle. The effectiveness of this principle suggests that non-realism is the key that explains why quantum theory.

12 pages, 2 figures in R. Bertlmann and A. Zeilinger (eds.), Quantum [Us]Speakables II (Springer, Switzerland, 2016), p. 189

References in corpus (6)

• A simple test for hidden variables in spin-1 system
• Simple explanation of the quantum violation of a fundamental inequality
• Higher-order interference and single-system postulates characterizing quantum theory
• Bounding quantum contextuality with lack of third-order intereference
• Simple explanation of the quantum limits of genuine $n$-body nonlocality
• Exclusivity principle and the quantum bound of the Bell inequality