Motional frequency shifts of trapped ions in the Lamb-Dicke regime

Details Motional frequency shifts of trapped ions in the Lamb-Dicke regime Motional frequency shifts of trapped ions in the Lamb-Dicke regime

2007-07-09

arxiv.org/abs/0707.1221v1

Phys. Rev. A 76, 033808 (2007)

Physics

Quantum Physics

9 pages, 6 figures

Scientific paper

10.1103/PhysRevA.76.033808

First order Doppler effects are usually ignored in laser driven trapped ions when the recoil frequency is much smaller than the trapping frequency (Lamb-Dicke regime). This means that the central, carrier excitation band is supposed to be unaffected by vibronic transitions in which the vibrational number changes. While this is strictly true in the Lamb-Dicke limit (infinitely tight confinement), the vibronic transitions do play a role in the Lamb-Dicke regime. In this paper we quantify the asymptotic behaviour of their effect with respect to the Lamb-Dicke parameter. In particular, we give analytical expressions for the frequency shift, ``pulling'' or ``pushing'', produced in the carrier absorption band by the vibronic transitions both for Rabi and Ramsey schemes. This shift is shown to be independent of the initial vibrational state.

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