High momentum entanglement of cold atoms generated by a single photon   scattering
  With the mechanism of pairwise scattering of photons between two atoms, we propose a novel scheme to highly entangle the motional state between two ultracold neutral atoms by a single photon scattering and detection. Under certain conditions, it is shown that an arbitrary amount of entanglement can be obtained with this scheme. 
Rui Guo, Xiaoji Zhou, Xuzong Chen