The unspeakable why

TL;DR

This paper proposes a simple principle that explains why quantum theory exhibits maximum violations of certain inequalities, suggesting non-realism as the core reason behind quantum phenomena.

Contribution

It introduces a unifying principle that accounts for key quantum limits, providing a new perspective on the foundational understanding of quantum theory.

Findings

Maximum violations of CHSH and Klyachko-Can-Binicioğlu-Shumovsky inequalities are explained by a simple principle.

Non-realism is identified as the fundamental reason for quantum theory's characteristics.

The principle's effectiveness indicates a potential new direction in understanding quantum foundations.

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-Binicio\u{g}lu-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.