Kavli Affiliate: Michael Wimmer
| First 5 Authors: Francesco Zatelli, David van Driel, Di Xu, Guanzhong Wang, Chun-Xiao Liu
| Summary:
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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