‘‘Dark’’ squeezed states of the motion of a trapped ion
J. I. Cirac, A. S. Parkins, R. Blatt, P. Zoller · Physical Review Letters · 1993
We propose a scheme for preparing coherent squeezed states of motion in an ion trap based on the multichromatic excitation of a trapped ion by standing- and traveling-wave light fields. The squeezed state is produced when the beat frequency between two standing-wave light fields is equal to twice the trap frequency, and is indicated by a ``dark resonance'' in the fluorescence emitted by the ion.