Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.31: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Tailoring the anharmonicity of the axial trapping potential an segmented micro-structured ion trap — •M. Tanveer Baig, Timm F. Gloger, Peter Kaufmann, Delia Kaufmann, Thomas Collath, Michael Johanning, and Christof Wunderlich — Faculty of Science and Technology, Department of Physics, University of Siegen, Walter Flex Str. 3, 57072 Siegen, Germany
The anharmonicity of an ion trap, often considered only as a perturbation, might be be decisive when splitting and merging ion strings and can also be an interesting tool to tailor normal modes and the coupling of ions and to create long ion strings. Here we tailor the anharmonicity of the axial trapping potential in a segmented micro-structured ion trap and quantify it by analyzing the axial center of mass (COM) and breathing mode of strings of up to two ions. Mode frequencies were determined by applying a small, near resonant tickling voltage to dc segment electrodes nearby and observing the drop in ion fluorescence, when the ions were resonantly heated.
The ratio of the breathing and COM mode frequency is expected to be νbreathe/νCOM = √3 for a perfect harmonic trap, due to the curvature of the Coulomb potential at the equilibrium separation of the ions. Interpolating between two different potentials with anharmonicities of different size and opposite sign, we are able to deviate from this value and we can show that we are able to tailor the anharmonicity while maintaining a constant curvature and thus COM mode within a range given by the voltage limitations of our voltage source [1].
[1] M. T. Baig et al., Rev. Sci. Instrum. 84, 124701 (2013)