Tunable Superconducting Coupling of Quantum Dots via Andreev Bound States in Semiconductor-Superconductor Nanowires

Journal article (2022)

Authors

C. Liu QRD/Wimmer Group - QuTech Advanced Research Centre , Kavli institute of nanoscience Delft, QuTech Advanced Research Centre
Guanzhong Wang QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QRD/Kouwenhoven Lab - QuTech Advanced Research Centre
T. Dvir QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QRD/Kouwenhoven Lab - QuTech Advanced Research Centre
M.T. Wimmer QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, QN/Wimmer Group - AS
Research Group
QRD/Kouwenhoven Lab (QuTech Advanced Research Centre) (TU Delft)
Copyright: © 2022 C. Liu, Guanzhong Wang, T. Dvir, M.T. Wimmer
DOI
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https://doi.org/10.1103/PhysRevLett.129.267701
More Info
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Published Date

2022

Language

English

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Faculty

QuTech Advanced Research Centre

Department

Qubit Research Division

Research Group

QRD/Kouwenhoven Lab

Abstract

Semiconductor quantum dots have proven to be a useful platform for quantum simulation in the solid state. However, implementing a superconducting coupling between quantum dots mediated by a Cooper pair has so far suffered from limited tunability and strong suppression. This has limited applications such as Cooper pair splitting and quantum dot simulation of topological Kitaev chains. In this Letter, we propose how to mediate tunable effective couplings via Andreev bound states in a semiconductor-superconductor nanowire connecting two quantum dots. We show that in this way it is possible to individually control both the coupling mediated by Cooper pairs and by single electrons by changing the properties of the Andreev bound states with easily accessible experimental parameters. In addition, the problem of coupling suppression is greatly mitigated. We also propose how to experimentally extract the coupling strengths from resonant current in a three-terminal junction. Our proposal will enable future experiments that have not been possible so far.