Coherent manipulation of motional states of trapped ions
  The beam splitter and phase shifter, which are the key elements in the experiments of light interference, are realized in the motion of trapped ions. Some applications, such as the creation of quantum motional states and the realization of Mach-Zehnder interferometer, are illustrated. Several detection methods of motional states used in the interferometer are also discussed. 
Hao-Sheng Zeng, Le-Man Kuang, Ke-Lin Gao