Beyond pure state entanglement for atomic ensembles

TL;DR

This paper proposes a scheme for generating and analyzing multipartite mixed state entanglement in atomic ensembles using a polarized light beam at specific angles, advancing the understanding of quantum matter-light interfaces.

Contribution

It introduces a realistic experimental setup to create and study multipartite mixed state entanglement beyond pure states in continuous variables.

Findings

Angles re crucial for shaping entanglement

Scheme enables addressing multipartite mixed state entanglement

Proposes practical experimental settings

Abstract

We analyze multipartite entanglement between atomic ensembles within quantum matter-light interfaces. In our proposal, a polarized light beam crosses sequentially several polarized atomic ensembles impinging on each of them at a given angle \alpha_i. These angles are crucial parameters for shaping the entanglement since they are directly connected to the appropriate combinations of the collective atomic spins that are squeezed. We exploit such scheme to go beyond the pure state paradigm proposing realistic experimental settings to address multipartite mixed state entanglement in continuous variables.