Andreev states

A deep analogy between topological materials and superconducting devices was recently theoretically established [1], in particular between a 3-dimensional topological solid and a 4-terminal superconducting junction. We propose to explore this analogy by designing and fabricating multiterminal superconducting junctions and by probing their quantized energy spectrum using circuit-QED techniques.

[1] R.-P. Riwar, M. Houzet, J. S. Meyer, Yuli V. Nazarov, Multi-terminal Josephson junctions as topological materials, arXiv:1503.06862