Mutually-commuting von Neumann algebra models of quantum networks and violation of Bell-type inequalities

TL;DR

This paper develops a von Neumann algebra framework for quantum networks, deriving Bell inequalities and structural conditions for their violation, advancing understanding of quantum correlations in infinite-dimensional systems.

Contribution

It introduces a von Neumann algebra model for quantum networks with arbitrary structures and identifies algebraic conditions for maximal Bell inequality violation.

Findings

Derived Bell-type inequalities within the von Neumann algebra framework.

Established bounds for Bell inequalities based on algebraic structures.

Identified structural conditions for maximal violation of Bell inequalities.

Abstract

Employing mutually-commuting von Neumann algebras to represent the algebra of observables on quantum systems provides a framework for studying quantum information theory in systems with infinite degrees of freedom and quantum field theory, yielding many profound results that differ from non-relativistic quantum systems. In this paper, we establish a mutually-commuting von Neumann algebra model of quantum networks with arbitrary structures. We derive Bell-type inequalities on this model, and determine various bounds for Bell-type inequalities based on the structure of underline von Neumann algebras, and identify the algebraic structural conditions required for their violation. The conditions on the algebraic structure of observables for maximal violation of Bell-type inequalities, which we discovered in the context of von Neumann algebra models, can in turn guide the search for measurements in the non-relativistic setting.