Entangled light from Bose-Einstein condensates

TL;DR

This paper proposes a method to generate continuous variable entangled light using a Bose-Einstein condensate in a cavity, leveraging collective atom-cavity interactions to produce entangled photon pairs.

Contribution

It introduces a novel scheme for entangling cavity modes via a Bose-Einstein condensate, utilizing experimentally demonstrated strong atom-cavity coupling.

Findings

Successful generation of entangled photon pairs from BEC-cavity system

Utilizes continuous pumping and spontaneous emission processes

Achieves steady, collective atom-cavity entanglement

Abstract

We propose a method to generate entangled light with a Bose-Einstein condensate trapped in a cavity, a system realized in recent experiments. The atoms of the condensate are trapped in a periodic potential generated by a cavity mode. The condensate is continuously pumped by a laser and spontaneously emits a pair of photons of different frequencies in two distinct cavity modes. In this way, the condensate mediates entanglement between two cavity modes which leak out and can be separated and exhibit continuous variable entanglement. The scheme exploits the experimentally demonstrated strong, steady and collective coupling of condensate atoms to a cavity field.