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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.1: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Optimized microwave near-field control in a planar ion trap — •Henning Hahn¹, Martina Carsjens^1,2, Amado Bautista^1,2, Sebastian Grondkowski¹, Timko Dubielzig¹, Matthias Kohnen^1,2, and Christian Ospelkaus^1,2 — ¹Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — ²Physikalisch-Technische Bundesanstalt, Quest Institut, Bundesallee 100, 38116 Braunschweig

Multi-qubit gates with trapped ions require a coupling of the common motional state to the internal spin state of an individual ion. Instead of the more commonly used focused laser beams, recent experiments have shown an alternative approach using magnetic microwave near-field gradients. In an initial demonstration experiment [1], the required field configuration was produced by three near-by microwave conductors integrated in a surface-electrode ion trap.

This poster presents numerical simulations for a second generation trap design [2] based on a single microwave conductor to produce the required field geometry. In particular, we analyse the ratio of sideband Rabi rates to parasitic carrier excitations for the field originating from a single meander-shaped conductor. After analysing the basic geometry, we consider the influence of integrating trap electrodes, fabrication tolerances, and extensions towards a multi-layer design with improved performance.

C. Ospelkaus et al., Nature 476, 181 (2011)
M. Carsjens et al., Appl. Phys. B 114, 243 (2014)