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We report direct detection of charge-tunneling between a quantum dot and asuperconducting island through radio-frequency gate sensing. We are able toresolve spin-dependent quasiparticle tunneling as well as two-particletunneling involving Cooper pairs. The quantum dot can act as an RF-only sensorto characterize the superconductor addition spectrum, enabling us to accesssubgap states without transport. Our results provide guidance for futuredispersive parity measurements of Majorana modes, which can be realized bydetecting the parity-dependent tunneling between dots and islands.

Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing