Multi-ion Mach-Zehnder interferometer with artificial nonlinear   interactions
  We show how to implement a Mach-Zehnder interferometry based upon a string of trapped ions with artificial nonlinear interactions. By adiabatically sweeping down/up the coupling strength between two involved internal states of the ions, we could achieve the beam splitting/recombination. Based on current techniques for manipulating trapped ions, we discuss the experimental feasibility of our scheme and analyze some undesired uncertainty under realistic experimental environment. 
Y. M. Hu, W. L. Yang, X. Xiao, Mang Feng, Chaohong Lee
quant-ph physics.atom-ph