An Atom Michelson Interferometer on a Chip Using a Bose-Einstein   Condensate
  An atom Michelson interferometer is implemented on an "atom chip." The chip uses lithographically patterned conductors and external magnetic fields to produce and guide a Bose-Einstein condensate. Splitting, reflecting, and recombining of condensate atoms are achieved by a standing-wave light field having a wave vector aligned along the atom waveguide. A differential phase shift between the two arms of the interferometer is introduced by either a magnetic-field gradient or with an initial condensate velocity. Interference contrast is still observable at 20% with atom propagation time of 10 ms. 
Ying-Ju Wang, Dana Z. Anderson, Victor M. Bright, Eric A. Cornell,   Quentin Diot, Tetsuo Kishimoto, Mara Prentiss, R. A. Sa...