Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 19: Ultracold atoms III: Manipulation and detection / Rydbergatoms (with Q)
A 19.2: Talk
Wednesday, March 4, 2009, 16:45–17:00, Audi-B
State-selective microwave near-field potentials on atom chips — •Pascal Böhi1,2, Max F. Riedel1,2, Theodor W. Hänsch1,2, and Philipp Treutlein1,2 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Fakultät für Physik, Ludwig-Maximilians-Universität München
The spectacular experiments with ultracold neutral atoms are intimately connected with the availability of sophisticated techniques for coherent control of internal and motional degrees of freedom of the atoms. For quantum information processing and quantum simulations, for example, tailored potentials are required which control atomic dynamics, but at the same time, control of internal degrees of freedom is needed. Potentials which are in principle arbitrarily configurable can be realized in static magnetic near-field traps on microfabricated ’atom chips’. However, state-selectivity is limited in these potentials.
In this talk we show how we use on-chip microwave near-fields to generate versatile state-selective potentials varying on a µ m scale and use these potentials for the state-selective coherent manipulation of Bose-Einstein condensates. We entangle atomic spin and motional state in a controlled and reversible way, as required for a quantum phase gate previously proposed [1]. Our system also constitutes a trapped-atom interferometer with internal-state labeling and is furthermore useful for experiments on squeezing and many-particle entanglement in Bose-Einstein condensates [2].
[1] P. Treutlein et al., Phys. Rev. A 74, 022312 (2006)
[2] Y. Li et al., arXiv:0807.1580 (2008)