Laser cooling of two trapped ions : sideband cooling beyond the Lamb-Dicke limit
Morigi, Giovanna (Universität Innsbruck. Institut für Theoretische Physik)
Eschner, Jürgen (Universität Innsbruck. Institut für Experimentalphysik)
Cirac Sasturáin, Juan Ignacio, 1965- (Universität Innsbruck. Institut für Theoretische Physik)
Zoller, P. (Universität Innsbruck. Institut für Theoretische Physik)
American Physical Society

Date:	1999
Abstract:	We study laser cooling of two ions that are trapped in a harmonic potential and interact by Coulomb repulsion. Sideband cooling in the Lamb-Dicke regime is shown to work analogously to sideband cooling of a single ion. Outside the Lamb-Dicke regime, the incommensurable frequencies of the two vibrational modes result in a quasicontinuous energy spectrum that significantly alters the cooling dynamics. The cooling time decreases nonlinearly with the linewidth of the cooling transition, and the effect of dark states which may slow down the cooling is considerably reduced. We show that cooling to the ground state is also possible outside the Lamb-Dicke regime. We develop the model and use quantum Monte Carlo calculations for specific examples. We show that a rate equation treatment is a good approximation in all cases.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review. A, Vol. 59, Issue 5 (May 1999) , p. 3797-3808, ISSN 1050-2947

DOI: 10.1103/PhysRevA.59.3797

12 p, 502.6 KB

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