Emergence of Quantum Correlations from Non-Locality Swapping

TL;DR

This paper explores how quantum correlations can emerge from non-locality swapping within generalized non-signalling theories, introducing a model that exhibits quantum-like dynamics and highlighting the boundary between quantum and post-quantum correlations.

Contribution

It introduces the concept of a genuine box and presents the first non-signalling model with quantum-like dynamics, including a device for non-locality swapping and teleportation.

Findings

Identification of a boundary between quantum and post-quantum correlations

Development of a coupler device enabling non-locality swapping

First model demonstrating quantum-like dynamics in non-signalling theories

Abstract

By studying generalized non-signalling theories, the hope is to find out what makes quantum mechanics so special. In the present paper, we revisit the paradigmatic model of non-signalling boxes and introduce the concept of a genuine box. This will allow us to present the first generalized non-signalling model featuring quantum-like dynamics. In particular, we present the coupler, a device enabling non-locality swapping, the analogue of quantum entanglement swapping, as well as teleportation. Remarkably, part of the boundary between quantum and post-quantum correlations emerges in our study.