Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Poster II

A 23.50: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

An electric field generator for versatile trapping potentials in segmented microstructured ion traps — •M. T. Baig, M. Ziolkowski, M. Johanning, D. Kaufmann, and Chr. Wunderlich — Fachbereich Physik, Universität Siegen, 57072 Siegen, Deutschland

A collection of laser cooled ions stored in a micro structured Paul trap (microtrap) is a promising tool for investigations in quantum information science. Such microtraps allow for sculpting the electric potential experienced by individual ions and thus to shuttle ions between different trap locations. In addition, the range and strength of magnetic gradient induced coupling (MAGIC [1]) between spins can be varied by changing these potentials.

For controlling the quasi-dc voltages applied to individual electrodes of the microtrap, we set up a prototype electric field generator, initially to create 20 dc electric potentials which can be multiplexed and applied to 70 dc electrodes of the microtrap. Each channel contains its own memory, a digital-to-analog-converter and an amplifier so every channel can be programmed independently to get the desired potential at the output. This system has a 20 MHz update rate, is precise to 1 mV with peak to peak voltages up to 15 V and low in noise (<±0.5 mV).

[1] M. Johanning, et al.; Phys. Rev. Lett. 102, 073004 (2009)