Polynomial Bell inequalities

TL;DR

This paper introduces a practical method for deriving polynomial Bell inequalities in complex quantum causal scenarios, expanding the tools for analyzing quantum nonlocality beyond simple cases.

Contribution

It provides a general approach to derive polynomial Bell inequalities for complex Bayesian network scenarios, advancing the understanding of quantum nonlocality.

Findings

Method successfully derives polynomial Bell inequalities in various scenarios

Reveals a natural connection between polynomial inequalities and non-signalling conditions

Extends the applicability of Bell inequalities to more complex quantum networks

Abstract

It is a recent realization that many of the concepts and tools of causal discovery in machine learning are highly relevant to problems in quantum information, in particular quantum nonlocality. The crucial ingredient in the connection between both fields is the tool of Bayesian networks, a graphical model used to reason about probabilistic causation. Indeed, Bell's theorem concerns a particular kind of a Bayesian network and Bell inequalities are a special case of linear constraints following from such models. It is thus natural to look for generalized Bell scenarios involving more complex Bayesian networks. The problem, however, relies on the fact that such generalized scenarios are characterized by polynomial Bell inequalities and no current method is available to derive them beyond very simple cases. In this work, we make a significant step in that direction, providing a general and practical method for the derivation of polynomial Bell inequalities in a wide class of scenarios, applying it to a few cases of interest. We also show how our construction naturally gives rise to a notion of non-signalling in generalized networks.