Coherent spin-current coupling in proximitized germanium (C05*)

• Subject Area: Experimental Condensed Matter Physics
• Term: since 2026
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 314695032

The project investigates semiconducting-superconducting quantum circuits that combine gate-defined proximitized quantum dots in germanium-based heterostructures and gate-controlled Josephson junctions with superconducting electrodes and phase-controlled loops such that strong spin-orbit interaction results in the coherent interaction between spinful Andreev bound states and supercurrents. Conversion of quantum information from semiconducting quantum dots to Andreev spin qubits and from Andreev spins to supercurrents, will allow the demonstration of longer distance spin-spin coupling mediated by superconductivity.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1277: Emergent Relativistic Effects in Condensed Matter: From Fundamental Aspects to Electronic Functionality
• Major Instrumentation: Cryogenic prober
• Applicant Institution: Universität Regensburg
• Project Head: Professor Dr. Ferdinand Kuemmeth, since 1/2026