  We report conductance and supercurrent measurements for InAs single and
parallel double quantum dot Josephson junctions contacted with Nb or NbTiN
superconducting electrodes. Large superconducting gap energy, high critical
field and large switching current are observed, all reflecting the features of
Nb-based electrodes. For the parallel double dots we observe an enhanced
supercurrent when both dots are on resonance, which may reflect split Cooper
pair tunneling.
