  Fractionally charged quasiparticles in the quantum Hall state with filling
factor $\nu=5/2$ are expected to obey non-Abelian statistics. We demonstrate
that their statistics can be probed by transport measurements in an electronic
Mach-Zehnder interferometer. The tunneling current through the interferometer
exhibits a characteristic dependence on the magnetic flux and a non-analytic
dependence on the tunneling amplitudes which can be controlled by gate
voltages.
