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Yokoyama, T. (author), Reutlinger, Johannes (author), Belzig, Wolfgang (author), Nazarov, Y.V. (author)We consider the spectrum of Andreev bound states (ABSs) in an exemplary four-terminal superconducting structure where four chaotic cavities are connected by quantum point contacts to the terminals and to each other forming a ring. We nickname the resulting device 4T-ring. Such a tunable device can be realized in a 2D electron gas...journal article 2017