A generalized no-broadcasting theorem

TL;DR

This paper extends the no-broadcasting theorem to a wide class of nonclassical probabilistic models, including super-quantum correlations, providing a simpler proof and broadening its applicability.

Contribution

It generalizes the no-broadcasting theorem to all nonclassical finite-dimensional models satisfying no-signaling, including super-quantum correlations, with a simplified proof.

Findings

The no-broadcasting theorem applies to all nonclassical models with no-signaling.

A strengthened quantum no-broadcasting theorem is established.

The proof is significantly simpler than previous approaches.

Abstract

We prove a generalized version of the no-broadcasting theorem, applicable to essentially \emph{any} nonclassical finite-dimensional probabilistic model satisfying a no-signaling criterion, including ones with ``super-quantum'' correlations. A strengthened version of the quantum no-broadcasting theorem follows, and its proof is significantly simpler than existing proofs of the no-broadcasting theorem.