Bounding entanglement wedge cross sections

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.

Automated summary

This study examines various inequalities for entanglement wedge cross sections (EWCSs) as dual gravity probes for multiparty systems. Surprisingly, it is found that the EWCS is neither clearly monogamous nor polygamous for tripartite systems, but rather depends on the details and dimensionality of the gravity solutions. We propose weaker monogamy relations for dual entanglement measures, leading to a new lower bound on EWCS. The study is conducted on a variety of gravity backgrounds, including pure anti de Sitter spaces, anti de Sitter black branes, Dp-brane-induced backgrounds, and cigar geometries in generic dimensions.