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I discuss the quantum dynamics of trapped ions in Rydberg states, which have large electric dipole moments induced by the trapping fields. In the limit where the localization of the ion core is much smaller than the Rydberg orbit the dynamics of the system is determined by the interplay between large dipole-dipole energy shifts and strong tunable internal-state-dependent forces due to dipole-charge interactions. This provides a new tool for manipulating and entangling ions by strong interactions and on fast time scales. |