Trapped ions in the strong-excitation regime: Ion interferometry and nonclassical states.

The interaction of a trapped ion with a laser beam in the strong excitation regime is analyzed. In this regime, a variety of non{classical states of motion can be prepared either by using laser pulses of well de ned area, or by an adiabatic passage scheme based on the variation of the laser frequency. We show how these states can be used to investigate fundamental properties of quantum mechanics. We also study possible applications of this system to build an ion interferometer.