Entanglement between two macroscopic fields by coherent atom-mediated exchange of photons

TL;DR

This paper demonstrates entanglement between two macroscopic light fields mediated by atomic coherence in a rubidium sample, advancing quantum information processing capabilities.

Contribution

It provides experimental evidence of entanglement between macroscopic beams via atom-mediated photon exchange in EIT conditions, linking atomic coherence to quantum correlations.

Findings

Quantum correlation established between pump and probe beams.

Entanglement intrinsically linked to atomic coherence.

Potential for practical quantum information applications.

Abstract

Using two different criteria for continuous variable systems we demonstrated that pump and probe beams became quantum correlated in a situation of Electromagnetically Induced Transparency in a sample of Rb atoms. Our result combines two important features for practical implementations in the field of quantum information processing. Namely, we proved the existence of entanglement between two macroscopic light beams, and this entanglement is intrinsically associated to a strong coherence in an atomic medium.