Abstract
AbstractVarious promising qubit concepts have been put forward recently based on engineered superconductor subgap states like Andreev bound states, Majorana zero modes or the Yu-Shiba-Rusinov (Shiba) states. The coupling of these subgap states via a superconductor strongly depends on their spatial extension and is an essential next step for future quantum technologies. Here we investigate the spatial extension of a Shiba state in a semiconductor quantum dot coupled to a superconductor. With detailed transport measurements and numerical renormalization group calculations we find a remarkable more than 50 nm extension of the zero energy Shiba state, much larger than the one observed in very recent scanning tunneling microscopy measurements. Moreover, we demonstrate that its spatial extension increases substantially in a magnetic field.
Funder
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Swiss National Science Foundation | National Center of Competence in Research Quantum Science and Technology
European Cooperation in Science and Technology
Danmarks Grundforskningsfond
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
Reference90 articles.
1. Padurariu, C. & Nazarov, Y. V. Spin blockade qubit in a superconducting junction. EPL (Europhys. Lett.) 100, 57006 (2012).
2. Janvier, C. et al. Coherent manipulation of andreev states in superconducting atomic contacts. Science 349, 1199–1202 (2015).
3. Park, S. & Yeyati, A. L. Andreev spin qubits in multichannel rashba nanowires. Phys. Rev. B 96, 125416 (2017).
4. Hays, M. et al. Direct microwave measurement of andreev-bound-state dynamics in a semiconductor-nanowire josephson junction. Phys. Rev. Lett. 121, 047001 (2018).
5. Tosi, L. et al. Spin-orbit splitting of andreev states revealed by microwave spectroscopy. Phys. Rev. X 9, 011010 (2019).
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