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 70μeV. 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.
@article{arxiv.2311.03193,
title = {Robust poor man's Majorana zero modes using Yu-Shiba-Rusinov states},
author = {Francesco Zatelli and David van Driel and Di Xu and Guanzhong Wang and Chun-Xiao Liu and Alberto Bordin and Bart Roovers and Grzegorz P. Mazur and Nick van Loo and Jan Cornelis Wolff and A. Mert Bozkurt and Ghada Badawy and Sasa Gazibegovic and Erik P. A. M. Bakkers and Michael Wimmer and Leo P. Kouwenhoven and Tom Dvir},
journal= {arXiv preprint arXiv:2311.03193},
year = {2024}
}