Information causality and non-locality swapping are equivalent from emergence of quantum correlations

TL;DR

This paper demonstrates that information causality and non-locality swapping are fundamentally equivalent in their role in distinguishing quantum correlations from more general non-signalling models, highlighting a shared foundational principle.

Contribution

It analytically derives emergence criteria for quantum correlations from information causality and shows their equivalence to the uselessness of coupler-based non-locality swapping.

Findings

Information causality and non-locality swapping are equivalent emergence criteria.

Non-locality swapping with a coupler cannot produce nonlocal correlations beyond quantum.

This equivalence helps distinguish quantum from generalized non-signalling theories.

Abstract

Is information causality a new physical principle? To answer this question, we first analytically derive the criteria of emergence of quantum correlations from information causality. Then it is shown that, as emergence criteria of quantum correlations, information causality and uselessness of coupler-based non-locality swapping can be regarded equivalent. Therefore, incapability of non-locality swapping using a coupler is as powerful as information causality in the single-out of quantum physics from generalized non-signalling models.