Quantum interference structures in trapped-ion dynamics beyond the Lamb-Dicke and rotating wave approximations
Dong Wang, Tony Hansson, Åsa Larson, Hans Karlsson, Jonas Larson · Physical Review A · 2008
We apply wave-packet methods to study an ion-trap system imposing neither the rotating wave nor the Lamb-Dicke approximations. By this approach we show the existence of states with restricted phase-space evolution as a genuine consequence of quantum interference between wave-packet fractions. A particular instance of such a state oscillates between maximal entanglement and pure disentanglement between the constitute subsystems, where the characteristic crossover time is very rapid. Over longer time periods the dynamics of these states exhibits collapse-revival patterns with well-resolved fractional revivals in autocorrelation, inversion, and entanglement.