Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Quantum information: Atoms and ions II
Q 13.5: Talk
Monday, March 17, 2014, 15:15–15:30, UDL HS3038
Surface-electrode Paul trap with optimized near-field microwave control — •Martina Carsjens1,2, Matthias Kohnen1,2, Timko Dubielzig2, Sebastian Grondkowski2, Kai Voges2, and Christian Ospelkaus2,1 — 1PTB, Braunschweig, Germany — 2Institut füt Quantenoptik, Hannover, Germany
We describe the design of a microfabricated Paul trap with integrated microwave conductors for quantum simulation and entangling logic gates. We focus on an approach where near-field amplitude gradients of microwave fields from conductors in the trap structure induce the required spin-motional couplings. This necessitates a strong amplitude gradient of the microwave near-field at the position of the ions, while the field itself needs to be suppressed as much as possible. We introduce a single meander-like microwave conductor structure which provides the desired field configuration. We optimize its parameters through full-wave microwave numerical simulations of the near-fields. The microwave conductor is integrated with additional dc and rf electrodes to form the actual Paul trap. We discuss the influence of the additional electrodes on the field configuration. To be able to fine-tune the overlap of the Paul trap rf null with the microwave field minimum, our trap design allows relative tuning of trap rf electrode amplitudes. Our optimized geometry could achieve a ratio of sideband-to-carrier excitations comparable to experiments with focused laser beams.