Superconducting nanostructures underpin the development of many promising quantum computing approaches and alternatives to conventional classical computing. Most work to date has focused on all-metallic systems. Recent developments in materials synthesis and nanofabrication have enabled devices that combine superconducting and semiconducting properties. These provide new opportunities for quantum science and technology that rely on the interplay between superconductivity, quantum confinement, and the ability to actively tune superconductivity. I will discuss a few a examples of such hybrid superconducting building blocks that we have developed in my group, with a focus on Josephson devices that couple more than two superconductors, forming multi-terminal Josephson junctions (MTJJs). These experiments enable us to realize unusual correlations between Cooper pairs, observe gate-tunable non-reciprocal superconductivity (superconducting diode effect) and can serve as a platform for realizing real-time tunable topological Josephson matter in higher-dimensional parameter spaces.
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[2] G. Graziano, M. Gupta et al., Nature Communications 13, 5933 (2022).
[3] M. Gupta et al., Nature Communications 14, 3078 (2023).
[4] M. Gupta et al., Nano Letters 24, 13903 (2024).
Vlad Pribiag, Professor, University of Minnesota
Host: Venkat Chandrasekhar