Classical, quantum and superquantum correlations

TL;DR

This paper explores the theoretical landscape of correlations in quantum mechanics, examining the potential for nonlocal theories that surpass quantum limits, aiming to deepen understanding of quantum correlations and their foundational principles.

Contribution

It generalizes and simplifies previous studies on crypto-nonlocal theories, investigating the possibility of correlations exceeding quantum bounds.

Findings

Crypto-nonlocal theories can theoretically surpass quantum correlation limits.

Simplified framework for analyzing nonlocal correlations.

Insights into the foundational principles of quantum mechanics.

Abstract

A deeper understanding of the origin of quantum correlations is expected to shred light on the physical principles underlying quantum mechanics. In this work, we reconsider the possibility of devising "crypto-nonlocal theories", using a terminology firstly introduced by Leggett. We generalize and simplify the investigations on this subject which can be found in the literature. At their deeper level, such theories allow nonlocal correlations which can overcome the quantum limit.