Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Ultra-cold atoms, ions and BEC (with A)
Q 12.30: Poster
Monday, February 29, 2016, 16:30–19:00, Empore Lichthof
Motional Mode Analysis of Trapped Ions — •Frederick Hakelberg, Henning Kalis, Matthias Wittemer, Manuel Mielenz, Ulrich Warring, and Tobias Schaetz — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg
Trapped ions present a promising system for quantum simulations [1]. However scaling to large systems present a major challenge. Surface-electrode traps with individually controllable potential wells offer a promising approach by allowing the design of arbitrary patterns of trapped ions [2]. The Coulomb coupling of ions in two distinct traps (separated by ≈40 µ m) has been shown [3]. In our experiment we trap 25Mg+ ions in a triangular surface-trap array with individual trap sites. The trap features 30 control electrodes which allow us to apply potentials for stray field compensation, and the control of motional-mode frequencies and mode orientations. We present two methods for measuring mode orientations and frequencies. The first is based on motional-sensitive two-photon stimulated-Raman transitions. The second makes use of oscillating control potentials generated by the control electrodes. We compare results with detailed models of both methods.
[1] Ch. Schneider et al., Rep. Prog. Phys. 75, 024401 (2012)
[2] T. Schaetz et al., New J. Phys. 15, 085009 (2013)
[3] K. R. Brown et al., Nature 471, 7337 (2013)