Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Atom and Ion Qubits (joint session QI/Q)

Q 15.2: Talk

Monday, March 10, 2025, 17:30–17:45, HS II

Scalable, high-fidelity all-electronic control of trapped-ion qubits — Clemens Löschnauer, Jacopo Mosca Toba, Amy Hughes, Steven King, •Marius Weber, Raghavendra Srinivas, Roland Matt, Rustin Nourshargh, David Allcock, Chris Ballance, Clemens Matthiesen, Maciej Malinowski, and Thomas Harty — Oxford Ionics, Oxford, United Kingdom

The central challenge of quantum computing is implementing high-fidelity quantum gates in a scalable fashion. Our all-electronic qubit control architecture combines laser-free gates with local tuning of electric potentials to enable site-selective single- and two-qubit operations in multi-zone quantum processors. Chip-integrated antennas deliver control fields common to all qubits, while voltages applied to local tuning electrodes adjust the position and motion of ions in each zone, thus enabling local coherent control. We experimentally implement low-noise, site-selective single- and two-qubit control in a microfabricated 7-zone ion trap, demonstrating 99.99916(7)% fidelity for single-qubit gates, and two-qubit Bell state generation with 99.97(1)% fidelity. These results validate the path to directly scaling these techniques to large-scale quantum computers based on electronically controlled trapped-ion qubits.

Keywords: trapped ions; gate fidelity; quantum control; qubit