Harvesting large scale entanglement in de Sitter space with multiple detectors

TL;DR

This paper investigates how multiple qubit detectors can harvest and reveal large-scale entanglement in de Sitter space, emphasizing the role of multipartite entanglement in accessing super horizon scale correlations.

Contribution

It derives a formula for entanglement negativity in a multi-detector system and demonstrates large-scale entanglement detection with many detectors in de Sitter space.

Findings

Large scale entanglement can be accessed with enough detectors

Multipartite entanglement is crucial for detecting super horizon correlations

The derived formula enables quantification of entanglement in this setting

Abstract

We consider entanglement harvesting in de Sitter space using a model of multiple qubit detectors. We obtain the formula of the entanglement negativity for this system. Applying the obtained formula, we find that it is possible to access to the entanglement on the super horizon scale if sufficiently large number of detectors are prepared. This result indicates the effect of the multipartite entanglement is crucial for detection of large scale entanglement in de Sitter space.