Non Degenerate Dual Atomic Parametric Amplifier: Entangled Atomic Fields
  In this paper, we investigate the dynamics of two coupled quantum degenerate atomic fields (BEC) interacting with two classical optical fields in the nonlinear atom optics regime. Two photon interaction produces entangled atom-atom pairs which exhibit nonclassical correlations. Since the system involves the creation of two correlated atom pairs, we call it the nondegenerate dual atomic parametric amplifier. 
Tarun Kumar, Aranya B. Bhattacherjee, Priyanka Verma, Narine Gevorgyan   and ManMohan
cond-mat.quant-gas