Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.9: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Towards multi-qubit near-field microwave quantum logic in a multi-layer surface-electrode trap — •Henning Hahn1,2, Giorgio Zarantonello1,2, Martina Wahnschaffe1,2, Matthias Kohnen1,2, Amado Bautista-Salvador1,2, and Christian Ospelkaus1,2 — 1Leibniz Universität Hannover, Germany. — 2Physikalisch-Technische Bundesanstalt, Braunschweig Germany.
In quantum information processing with trapped ions, tightly focused laser beams are typically used for coupling internal states and motional states of individual ions as required for multi-qubit entangling gates. However, scaling laser-based techniques for multi-qubit gates remains challenging. In an alternative approach, the desired state coupling is achieved by oscillating microwave near-field gradients created by currents in conductors embedded in a planar ion trap. In an adaption of the first demonstration setup [1], the number of microwave electrodes was reduced to a single meander-like conductor to suppress previously limiting relative phase and current fluctuations by design [2].
Here we discuss the integration of a meander-like conductor into a multi-layer ion trap and address the fabrication process involved. Since residual magnetic fields are reduced, less excitation on off-resonant carrier transitions is expected and thus, gate fidelities can be improved. Moreover, we show a vacuum setup with built-in Ar+ bombardment for reducing motional heating rates by in-situ electrode cleaning [3].
[1] C. Ospelkaus et al., Nature, 476, 181 (2011)
[2] M. Carsjens et al., Appl. Phys. B 114, 243 (2014)
[3] D. A. Hite et al., Phys. Rev. Lett. 109, 103001 (2012)