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MON: Monday Contributed Sessions

MON 4: DPG Promotionskolleg Next Generation Computing

MON 4.6: Vortrag

Montag, 8. September 2025, 15:30–15:45, ZHG004

Silicon-germanium: A platform for both, spin qubit and superconducting planar qubit circuits — •Pauline Drexler and Jakob Walsh — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany

Silicon-germanium in principle offers a unique possibility to implement two very different types of solid-state qubits within the same materials platform: semiconductor spin qubits and superconducting flux qubits. In this approach, spin qubits are realized in Coulomb blockade-based quantum dots. Flux qubits are envisioned to be created via assemblies of gate-tunable hybrid Josephson junctions, based on a superconducting film, in proximity interaction with the semiconductor. The common basis of both types of quantum circuits is an epitaxially grown silicon-germanium quantum-confined semiconductor thin film structure. Each type of qubit then essentially relies on different planar, surface electrode circuitry layouts. In my presentation, I will discuss the epitaxy of hybrid semiconductor structures and practical aspects of the realization of both types of qubits quantum circuits. I will highlight the advantages of the planar circuit approach regarding scaling of future quantum processors and the high compatibility of the silicon-germanium platform with the current semiconductor chip industry.

Keywords: Quanten Computing; Superconducting Qubit; Spin-Qubit; Germanium; Silicon