Spin dynamics in a two dimensional quantum gas

TL;DR

This paper explores spin dynamics in a 2D quantum gas, revealing how spin-changing collisions produce correlated clouds with ring-shaped density distributions, advancing understanding of quantum entanglement in atomic systems.

Contribution

It demonstrates the creation of correlated spin clouds in a 2D quantum gas and models their behavior using a Bogoliubov approach, highlighting potential for non-local entanglement.

Findings

Opposite spin clouds are spontaneously generated via spin-changing collisions.

Density distributions depend on magnetic field and match Bogoliubov model predictions.

Momentum correlations suggest potential for non-local EPR entanglement.

Abstract

We have investigated spin dynamics in a 2D quantum gas. Through spin-changing collisions, two clouds with opposite spin orientations are spontaneously created in a Bose-Einstein condensate. After ballistic expansion, both clouds acquire ring-shaped density distributions with superimposed angular density modulations. The density distributions depend on the applied magnetic field and are well explained by a simple Bogoliubov model. We show that the two clouds are anti-correlated in momentum space. The observed momentum correlations pave the way towards the creation of an atom source with non-local Einstein-Podolsky-Rosen entanglement.