Robust poor man’s Majorana zero modes using Yu-Shiba-Rusinov states

Francesco Zatelli, David van Driel, Di Xu, Guanzhong Wang, Chun-Xiao Liu, Alberto Bordin, Bart Roovers, Grzegorz P. Mazur, Nick van Loo, Jan C. Wolff, A. Mert Bozkurt, Ghada Badawy, Sasa Gazibegovic, Erik P. A. M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven () and Tom Dvir
Additional contact information
Francesco Zatelli: Delft University of Technology
David van Driel: Delft University of Technology
Di Xu: Delft University of Technology
Guanzhong Wang: Delft University of Technology
Chun-Xiao Liu: Delft University of Technology
Alberto Bordin: Delft University of Technology
Bart Roovers: Delft University of Technology
Grzegorz P. Mazur: Delft University of Technology
Nick van Loo: Delft University of Technology
Jan C. Wolff: Delft University of Technology
A. Mert Bozkurt: Delft University of Technology
Ghada Badawy: Eindhoven University of Technology
Sasa Gazibegovic: Eindhoven University of Technology
Erik P. A. M. Bakkers: Eindhoven University of Technology
Michael Wimmer: Delft University of Technology
Leo P. Kouwenhoven: Delft University of Technology
Tom Dvir: Delft University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Kitaev chains in quantum dot-superconductor arrays are a promising platform for the realization of topological superconductivity. As recently demonstrated, even a two-site chain can host Majorana zero modes known as “poor man’s Majorana”. Harnessing the potential of these states for quantum information processing, however, requires increasing their robustness to external perturbations. Here, we form a two-site Kitaev chain using Yu-Shiba-Rusinov states in proximitized quantum dots. By deterministically tuning the hybridization between the quantum dots and the superconductor, we observe poor man’s Majorana states with a gap larger than 70 μeV. The sensitivity to charge fluctuations is also greatly reduced compared to Kitaev chains made with non-proximitized dots. The systematic control and improved energy scales of poor man’s Majorana states realized with Yu-Shiba-Rusinov states will benefit the realization of longer Kitaev chains, parity qubits, and the demonstration of non-Abelian physics.

Date: 2024
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DOI: 10.1038/s41467-024-52066-2

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