Crossed Andreev Reflection and Elastic Cotunneling in Three Quantum Dots Coupled by Superconductors
A. Bordin (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - Communication QuTech)
Xiang Li (Kavli institute of nanoscience Delft)
David van Driel (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
J.C. Wolff (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Q. Wang (Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
S.L.D. ten Haaf (Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
Guanzhong Wang (Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group)
N. van Loo (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Leo P. Kouwenhoven (TU Delft - QN/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
T. Dvir (TU Delft - Qubit Research Division, Kavli institute of nanoscience Delft)
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Abstract
The formation of a topological superconducting phase in a quantum-dot-based Kitaev chain requires nearest neighbor crossed Andreev reflection and elastic cotunneling. Here, we report on a hybrid InSb nanowire in a three-site Kitaev chain geometry - the smallest system with well-defined bulk and edge - where two superconductor-semiconductor hybrids separate three quantum dots. We demonstrate pairwise crossed Andreev reflection and elastic cotunneling between both pairs of neighboring dots and show sequential tunneling processes involving all three quantum dots. These results are the next step toward the realization of topological superconductivity in long Kitaev chain devices with many coupled quantum dots.