Triplet-blockaded Josephson supercurrent in double quantum dots
D. Bouman (TU Delft - BUS/Quantum Delft, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
R.J.J. van Gulik (TU Delft - BUS/Quantum Delft, Kavli institute of nanoscience Delft)
Gorm Steffensen (University of Copenhagen)
Dávid Pataki (Budapest University of Technologyand Economics, Budapest)
Péter Boross (Wigner Research Centre for Physics, Budapest)
Peter Krogstrup (University of Copenhagen)
J. Nygård (University of Copenhagen)
Jens Paaske (University of Copenhagen)
András Pályi (Budapest University of Technologyand Economics, Budapest)
A. Geresdi (TU Delft - QuTech Advanced Research Centre, Chalmers University of Technology, Kavli institute of nanoscience Delft, TU Delft - QRD/Geresdi Lab)
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Abstract
Serial double quantum dots created in semiconductor nanostructures provide a versatile platform for investigating two-electron spin quantum states, which can be tuned by electrostatic gating and an external magnetic field. In this Rapid Communication, we directly measure the supercurrent reversal between adjacent charge states of an InAs nanowire double quantum dot with superconducting leads, in good agreement with theoretical models. In the even charge parity sector, we observe a supercurrent blockade with increasing magnetic field, corresponding to the spin singlet to triplet transition. Our results demonstrate a direct spin to supercurrent conversion, the superconducting equivalent of the Pauli spin blockade. This effect can be exploited in hybrid quantum architectures coupling the quantum states of spin systems and superconducting circuits.
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