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We have performed microwave spectroscopy of Andreev states in superconductingweak links tailored in an InAs-Al (core-full shell) epitaxially-grown nanowire.The spectra present distinctive features, with bundles of four lines crossingwhen the superconducting phase difference across the weak link is 0 or $\pi.$We interpret these as arising from zero-field spin-split Andreev states. Asimple analytical model, which takes into account the Rashba spin-orbitinteraction in a nanowire containing several transverse subbands, explainsthese features and their evolution with magnetic field. Our results show thatthe spin degree of freedom is addressable in Josephson junctions, andconstitute a first step towards its manipulation.

Spin-orbit splitting of Andreev states revealed by microwave spectroscopy