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Q: Fachverband Quantenoptik und Photonik
Q 23: Quantum Information I
Q 23.8: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Towards high-fidelity Mølmer-Sørensen gate in a cryogenic surface-electrode ion trap — Niklas Orlowski1, •Niels Kurz1, Timko Dubielzig1, Sebastian Halama1, Chloë Allen-ede1, Celeste Torkzaban1, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2Physikalisch-Technische-Bundesanstalt Braunschweig, Bundesallee 100, 38116 Braunschweig
Practical scalable quantum computing requires quantum logic gate errors below 10−4 in order for error-correction strategies to work. The microwave near-field approach for trapped-ion quantum logic gates has the potential to be scalable and has been shown to allow entangling gates on 9Be+ ions in a room temperature surface trap with infidelities approaching 10−3. In an equivalent cryogenic setup based on a similar trap structure [2], we expect the infidelity contribution due to anomalous motional heating to be strongly suppressed. We describe technical improvements in our setup that aim at reducing other sources of infidelities related to the motion of the ions to similar levels. We characterize the shift of mode frequencies that occur during gate operations due to heating effects in constant duty-cycle sequences and evaluate the performance of a newly installed, galvanically coupled RF resonator with regard to the radial mode stability.