Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics II
Q 31.4: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Ion Surface Trap Heating Rate Measurements, and Progress towards In-Situ Surface Cleaning by Argon Ion Sputtering — •Frederick Hakelberg, Matthias Wittemer, Manuel Mielenz, Henning Kalis, Ulrich Warring, and Tobias Schaetz — Physikalisches Institut, Albert-Ludwigs Universität Freiburg
Laser-cooled ions offer a promising system for quantum simulations [1]. Yet scaling to larger systems still proves to be challenging. Surface traps with individually controllable potential wells offer a promising approach by allowing the design of arbitrary patterns of trapped ions [2]. However, the small distances between the ions and the surface of the trap lead to increased motional heating causing motional decoherence on a timescale relevant to simulations. This effect is currently assumed to be caused by monolayers of carbon deposited on the trap surface. In our experiment we use a triangular trap array with individual pseudopotential minima for each ion. Current heating rates of our setup are in the order of 4 quanta per millisecond for 25Mg+ Ions trapped 40 µm above the surface at 2π×2.5 MHz trapping frequency, which is comparable to measurements performed by other groups in conventional 1D-surface traps. We follow an approach utilizing a high energy argon ion beam inside the experimental chamber to sputter impurities from the trap surface [3]. We present the progress made towards realization of this in-situ cleaning.
[1] Ch. Schneider et al., Rep. Prog. Phys. 75, 024401 (2012)
[2] T. Schaetz et al., New J. Phys. 15, 085009 (2013)
[3] D.A. Hite et al., Phys. Rev. Lett. 109, 103001 (2012)