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Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.29: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Laser Systems for Manipulation of 9Be+ — •K. Voges1, M. Kohnen2,1, M. Carsjens2,1, T. Dubielzig1, S. Grondkowski1, H. Hahn1, M. Niemann1, A.-G. Paschke1, and C. Ospelkaus1,21Institut für Quantenoptik, Leibniz Universität Hannover — 2QUEST-Institute @ PTB, Braunschweig

Multi-qubit interactions for quantum information processing with trapped ions require a coupling between individual ion-qubits and a shared motional degree of freedom. Recent experiments have shown how such interactions can be realized using microwave near-fields rather than laser beams [1]. In one of the present projects in our group, we are developing advanced near-field trap designs with 9Be+ hyperfine qubits. In our second project, we are developing quantum logic spectroscopy techniques for single (anti-)protons with the ultimate goal of a g-factor based test of CPT invariance [2]. For both projects, we discuss laser systems for trap loading, cooling, repumping and controlling of 9Be+ qubit ions. For efficient trap loading through ablation, we are testing a pulsed laser system. Moreover, we are setting up a frequency quadrupled infrared laser to implement a multi-photon process for ionization of Beryllium atoms. The light for Doppler cooling, repumping and Raman transitions will be provided by three tunable infrared fiber lasers generating two beams via sum-frequency generation and second harmonic generation (similar to [3]).

[1] C. Ospelkaus et al., Nature 476, 181 (2011).

[2] D. J. Heinzen and D. J. Wineland, Phys. Rev. A 42, 2977 (1990).

[3] A.C. Wilson et al., Appl. Phys. B, 105: 741-748 (2011).

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