  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.
