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Quantum dots are gate-defined within InSb nanowires, in proximity to NbTiNsuperconducting contacts. As the coupling between the dot and thesuperconductor is increased, the odd-parity occupations become non-discernible(erased) both above and below the induced superconducting gap. Above the gap,conductance in the odd Coulomb valleys increases until the valleys are lifted.Below the gap, Andreev bound states undergo quantum phase transitions tosinglet ground states at odd occupancy. We observe that the apparent erasure ofodd-parity regimes coincides at low-bias and at high-bias. This observation isreproduced in numerical renormalization group simulations, and is explainedqualitatively by a competition between Kondo temperature and the inducedsuperconducting gap. In the erased odd-parity regime, the quantum dot exhibitstransport features similar to a finite-size Majorana nanowire, drawingparallels between even-odd dot occupations and even-odd one-dimensional subbandoccupations.

Erasing odd-parity states in semiconductor quantum dots coupled to superconductors