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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.51: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Fast and high-fidelity motional control of trapped ions — •Jan-Philipp Schröder, Matthias Wittemer, Frederick Hakelberg, Henning Kalis, Manuel Mielenz, Govinda Clos, Ulrich Warring, and Tobias Schaetz — Albert-Ludwigs-Universität Freiburg, Germany

Laser-cooled ions, trapped in radio-frequency potentials, are promising candidates for experimental quantum simulations. In addition to the manipulation of their electronic states (pseudo spin), precise control of the motional states is crucial.
We report on experiments with Mg⁺ ions in a linear rf Paul trap and a triangular surface-electrode trap. An arbitrary waveform generator based on a FPGA enables real-time control of the motional degrees of freedom within microseconds. To apply high-frequency waveforms while suppressing electric-field noise, which would lead to motional heating of the ions, we embed switchable low-pass filters. This allows us to create a short time window with higher cut-off frequencies and thereby faster response. Additionally, we compensate the low-pass properties by utilizing an inverse transfer function of the control circuitry’s frequency response. These novel implementations may allow precise studies of phenomena like thermalization [1], quantum memory effects [2] and their time scales in isolated and open quantum systems.
[1] G. Clos et al., Phys. Rev. Lett. 117, 170401 (2016)

[2] M. Wittemer et al., arXiv:1702.07518 (2017)