Bounding entanglement wedge cross sections

TL;DR

This paper investigates the properties of entanglement wedge cross sections (EWCSs) in various gravity backgrounds, revealing that their monogamy relations depend on geometry and proposing new bounds for dual entanglement measures.

Contribution

It provides a detailed analysis of EWCS inequalities across multiple gravity solutions and introduces weaker monogamy relations with a new lower bound for EWCS.

Findings

EWCS is not universally monogamous or polygamous in tripartite systems.

Monogamy relations for dual entanglement measures can be weakened.

A new lower bound on EWCS is proposed based on geometry-dependent relations.

Abstract

The entanglement wedge cross sections (EWCSs) are postulated as dual gravity probes to certain measures for the entanglement of multiparty systems. We test various proposed inequalities for EWCSs. As it turns out, contrary to expectations, the EWCS is not clearly monogamous nor polygamous for tripartite systems but the results depend on the details and dimensionality of the geometry of the gravity solutions. We propose weaker monogamy relations for dual entanglement measures, which lead to a new lower bound on EWCS. Our work is based on a plethora of gravity backgrounds: pure anti de Sitter spaces, anti de Sitter black branes, those induced by a stack of Dp-branes, and cigar geometries in generic dimension.