Triplet-blockaded Josephson supercurrent in double quantum dots

Journal article (2020)

Authors

D. Bouman Kavli institute of nanoscience Delft, QuTech Advanced Research Centre, BUS/Quantum Delft - QuTech Advanced Research Centre
R.J.J. van Gulik BUS/Quantum Delft - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft
Gorm O. 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
Jesper Nygård University of Copenhagen
Jens Paaske University of Copenhagen
András Pályi Budapest University of Technologyand Economics, Budapest
A. Geresdi QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QRD/Geresdi Lab - QuTech Advanced Research Centre , Chalmers University of Technology
Research Group
BUS/Quantum Delft (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2020 D. Bouman, R.J.J. van Gulik, Gorm Steffensen, Dávid Pataki, Péter Boross, Peter Krogstrup, Jesper Nygård, Jens Paaske, András Pályi, A. Geresdi
DOI: https://doi.org/10.1103/PhysRevB.102.220505
More Info
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Published Date

2020

Language

English

Faculty

QuTech Advanced Research Centre

Department

Business Development

Research Group

BUS/Quantum Delft

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.