Abstract

C05 fabricates and operates 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.