Josephson coupling through one-dimensional ballistic channel in semiconductor-superconductor hybrid quantum point contacts

Hiroshi Irie, Yuichi Harada, Hiroki Sugiyama +1

We study a superconducting quantum point contact made of a narrow In${}_{0.75}$Ga${}_{0.25}$As channel with Nb proximity electrodes. The narrow channel is formed in a gate-fitted con…