Spin dynamics in a two dimensional quantum gas
  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. 
Poul L. Pedersen and Miroslav Gajdacz and Frank Deuretzbacher and Luis   Santos and Carsten Klempt and Jacob F. Sherson and ...
cond-mat.quant-gas physics.atom-ph quant-ph