Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 78: Quantum Computation: Hardware Platform III
FM 78.4: Talk
Donnerstag, 26. September 2019, 15:00–15:15, 1199
Near-field microwave quantum logic with 9Be+ ions — Henning Hahn2,1, Giorgio Zarantonello1,2, Marius Schulte3, Jonathan Morgner1,2, Amado Bautista-Salvador2,1, Klemens Hammerer3, and •Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2PTB, Bundesallee 100, 38116 Braunschweig — 3Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstr. 2, 30167 Hannover
Near-field microwave fields allow the implementation of an integrated entangling gate mechanism for trapped-ion qubits in surface-electrode trap arrays [1]. We present a tailored near-field microwave conductor structure which has recently allowed us [2] to realize an entangling gate operation between two 9Be+ ion qubits using long-lived field-independent “clock” states. We establish a gate error budget through comparison to numerical simulations and find that the gate operation is at present not limited by any mechanism inherent to the method, and all leading order infidelity contributions can be dealt with using straigt-forward technical measures that have already been implemented for other (laser and microwave based) implementations. We discuss further methods which we hope will reduce the infidelity significantly and give an outlook towards the extension to multi-zone trap arrays.
[1] C. Ospelkaus et al., Nature 476, 181 (2011)
[2] H. Hahn et al., arXiv:1902.07028 [quant-ph] (2019)