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arXiv · 2311.03193

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 Cornelis Wolff·A. Mert Bozkurt·Ghada Badawy·Sasa Gazibegovic·Erik P. A. M. Bakkers·Michael Wimmer·Leo P. Kouwenhoven·Tom Dvir
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Abstract

The recent realization of a two-site Kitaev chain featuring "poor man's Majorana" states demonstrates a path forward in the field of topological superconductivity. 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 proximitized quantum dots hosting Yu-Shiba-Rusinov states. The strong hybridization between such states and the superconductor enables the creation of poor man's Majorana states with a gap larger than $70 \mathrm{~\mu eV}$. It also greatly reduces the charge dispersion compared to Kitaev chains made with non-proximitized quantum dots. The large gap and reduced sensitivity to charge fluctuations will benefit qubit manipulation and demonstration of non-abelian physics using poor man's Majorana states.

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Francesco Zatelli, David van Driel, Di Xu, Guanzhong Wang, Chun-Xiao Liu, Alberto Bordin, Bart Roovers, Grzegorz P. Mazur, Nick van Loo, Jan Cornelis Wolff, A. Mert Bozkurt, Ghada Badawy, Sasa Gazibegovic, Erik P. A. M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven, Tom Dvir. 2023-11-06. Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states. https://doi.org/10.1038/s41467-024-52066-2

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