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The formation of a topological superconducting phase in a quantum-dot-basedKitaev chain requires nearest neighbor crossed Andreev reflection and elasticco-tunneling. Here we report on a hybrid InSb nanowire in a three-site Kitaevchain geometry - the smallest system with well-defined bulk and edge - wheretwo superconductor-semiconductor hybrids separate three quantum dots. Wedemonstrate pairwise crossed Andreev reflection and elastic co-tunnelingbetween both pairs of neighboring dots and show sequential tunneling processesinvolving all three quantum dots. These results are the next step towards therealization of topological superconductivity in long Kitaev chain devices withmany coupled quantum dots.

Crossed Andreev reflection and elastic co-tunneling in a three-site Kitaev chain nanowire device