Quantum correlations require multipartite information principles

TL;DR

This paper demonstrates that bipartite information principles are insufficient to characterize quantum correlations in multi-party systems, highlighting the need for new multipartite information concepts.

Contribution

It proves a fundamental limitation of bipartite information principles in describing quantum correlations across multiple parties.

Findings

Bipartite information principles cannot fully characterize quantum correlations.

Quantum correlations exhibit complex multipartite structures.

New multipartite information concepts are necessary for complete understanding.

Abstract

Identifying which correlations among distant observers are possible within our current description of Nature, based on quantum mechanics, is a fundamental problem in Physics. Recently, information concepts have been proposed as the key ingredient to characterize the set of quantum correlations. Novel information principles, such as, information causality or non-trivial communication complexity, have been introduced in this context and successfully applied to some concrete scenarios. We show in this work a fundamental limitation of this approach: no principle based on bipartite information concepts is able to single out the set of quantum correlations for an arbitrary number of parties. Our results reflect the intricate structure of quantum correlations and imply that new and intrinsically multipartite information concepts are needed for their full understanding.