The Andreev bound states are a hallmark of the theory of superconducting weak links. Using the versatile Josephson effect as source, device and detector, these spin-1/2 states have been directly observed. See Letter p.312
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Gustavsson, S., Oliver, W. Andreev states taken to the next level. Nature 499, 286–287 (2013). https://doi.org/10.1038/499286a
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DOI: https://doi.org/10.1038/499286a
