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We report shot noise measurements for a quantum dot formed in an InAsnanowire suspended between superconducting electrodes. We find a clearalternation for the shot noise value in the Coulomb blockade regime betweeneven and odd electron occupation in the dot, indicating that super-Poissonian(Poissonian) shot noise with the Fano factor reaching around 2 (1) occurs foreven (odd) parity. With increasing magnetic field, the parity effect disappearsand all the regimes show the Fano factor of around 1. The whole observation inour experiments quantitatively agrees with simulation obtained fromfull-counting statistics of cotunneling including spin-flip relaxation process,which corresponds to modelling electron motion in a quantum dot with strongspin-orbit interaction.

Parity-dependent shot noise and spin-flip relaxation process in a hybrid superconductor-nanowire quantum dot