Attila Geresdi

Semiconductor double quantum dots (DQDs) provide a versatile platform where the orbital and spin states of localized electrons can be controlled and measured. Thus, they became one of the preferred physical implementations of solid state quantum bits, where the internal spin degree of freedom is accessible via either spin-dependent tunneling to the leads, charge sensing techniques or dipole coupling to a microwave resonator. In this talk, I showcase that the Josephson supercurrent is also sensitive to the internal state of the DQD, and it is therefore a novel means to couple spin-based quantum bits to superconducting quantum circuits. I will show our experiments addressing the current-phase relationship of an InAs nanowire DQD with superconducting aluminum leads and demonstrate that a theoretical model using the spin-orbit length and the Lande g-factor as input parameters is in excellent agreement with our results.