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Scaling up a sign-ordered Kitaev chain without magnetic flux control

Journal Article (2025)
Author(s)

C. Liu (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft)

S. Miles (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

A. Bordin (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

S.L.D. ten Haaf (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)

G.P. Mazur (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

A.M. Bozkurt (TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)

M.T. Wimmer (Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group, TU Delft - QN/Wimmer Group, TU Delft - QuTech Advanced Research Centre)

Research Group
QRD/Wimmer Group
DOI related publication
https://doi.org/10.1103/PhysRevResearch.7.L012045
More Info
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Publication Year
2025
Language
English
Research Group
QRD/Wimmer Group
Issue number
1
Volume number
7
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Abstract

Quantum-dot-superconductor arrays have emerged as a new and promising material platform for realizing topological Kitaev chains. So far, experiments have implemented a two-site chain with limited protection. Here, we propose an experimentally feasible protocol for scaling up the chain in order to enhance the protection of the Majorana zero modes. To this end, we make use of the fact that the relative sign of normal and superconducting hoppings mediated by an Andreev bound state can be changed by electrostatic gates. In this way, our method only relies on the use of individual electrostatic gates on hybrid regions, quantum dots, and tunnel barriers, respectively, without the need for individual magnetic flux control, greatly simplifying the device design. Our work provides guidance for realizing a topologically protected Kitaev chain, which is the building block of error-resilient topological quantum computation.