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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.17: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Microwave near-field potentials for the generation of many-particle entanglement in a Bose gas — •Max Fabian Riedel, Pascal Böhi, Theodor Wolfgang Hänsch, and Philipp Treutlein — Max-Planck-Institut für Quantenoptik und LMU München

We report an experiment on the coherent manipulation of small Bose-Einstein condensates with state-selective potentials generated by on-chip microwave near-fields. We characterize the microwave near-field distribution on the µ m scale and show how we use the potentials to entangle atomic spin and motional state of a BEC in a controlled and reversible way. This is the key ingredient for a quantum phase gate previously proposed in [1].

Beyond quantum information processing, our system is ideally suited to tune inter-species vs. intra-species interactions in a two-component Bose gas by controlling wave function overlap. This can be utilized to generate squeezing and many-particle entanglement in BECs [2]. We report on the progress of experiments investigating this possibility further.

[1] P. Treutlein, T. W. Hänsch, J. Reichel, A. Negretti, M. A. Cirone, and T. Calarco, Phys. Rev. A 74, 022312 (2006)

[2] Y. Li, P. Treutlein, J. Reichel, A. Sinatra, arXiv:0807.1580 (2008)