Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 38: Materials and Devices for Quantum Technology II
HL 38.8: Talk
Thursday, March 12, 2026, 11:30–11:45, POT/0051
Scalable and individual control of Si qubits via magnetic skyrmions — •Leander Reascos1, Raluca Boltje1, Kai Litzius1, Felix Büttner1,2, and Mónica Benito1 — 1Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
Scalable, precise control of spin qubits is essential for large-scale quantum processors with millions of qubits. Electron-spin qubits in semiconductor quantum dots are promising due to their small size, high fidelities, long coherence times, and CMOS compatibility. However, current electric-dipole spin resonance (EDSR) schemes rely on static micromagnets, which suffer from fabrication-induced inhomogeneities and limited tunability. We propose using gate-tunable nanoscale magnetic skyrmions as on-chip magnetic field sources to replace micromagnets. By controlling skyrmion geometry, the local magnetic field at a quantum dot can be tuned post-fabrication to adjust both the qubit frequency and the EDSR driving gradient. Using micromagnetic simulations and analytical modeling, we show how skyrmion geometry maps directly onto the qubit’s Zeeman splitting and Rabi frequency. These results highlight skyrmion-based control as a promising route towards scalable, frequency-selective spin-qubit architectures with enhanced tunability.
Keywords: Spin qubits; Magnetic skyrmions; Electric dipole spin resonance (EDSR); Tunable magnetic field gradients; Scalable qubit architectures