Multiplet Supercurrents in a Josephson Circuit

Multiterminal Josephson circuits have been proposed as a promising platform to host synthetic topological phases of matter, Floquet states, and multiplet supercurrents that are mediated by pairs of Cooper pairs. Here, we explore a Josephson circuit in which three superconducting electrodes are connected through Josephson junctions to a common superconducting island. We demonstrate the dynamic generation of the multiplet supercurrents, which are found to be robust to elevated temperatures and are confirmed by exhibiting the expected Shapiro step quantization under a microwave drive. We also find an unexpected novel supercurrent, which couples a pair of contacts that are both voltage-biased with respect to the common superconducting island. We show that this supercurrent also results from synchronization of the phase dynamics of the device, opening pathways to study the interplay of nonlinear, quantum, and topological physics.