Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 35: Poster I
Q 35.20: Poster
Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof
Near-field Microwave Quantum Logic with Trapped Ions — •Martina Carsjens1,2, Matthias Kohnen1,2, Timko Dubielzig1, Anna-Greta Paschke1, Malte Niemann1, and Christian Ospelkaus1,2 — 1QUEST, Institut für Quantenoptik, Leibniz Universität Hannover — 2QUEST, PTB Braunschweig
Multi-qubit interactions for quantum information processing with trapped ions require a coupling between individual ion-qubits and a shared motional degree of freedom as a quantum bus. Recent experiments have shown how such interactions can be realized using microwave near-fields rather than the widely used laser fields. The near-field approach holds great promise for integration, simplification and operation fidelities. To achieve these goals, the structure supplying the microwave fields needs to be well understood and optimized. We report on efficient and accurate numerical simulations of microwave guiding structures. Furthermore, near-field manipulation requires close proximity of ion-qubits to conductors, where anomalous motional heating can be a significant source of decoherence. To suppress these detrimental effects in our experiments, we have developed a low-vibration closed-cycle cryogenic setup.