Hybrid superconducting-semiconducting quantum circuits

The hybrid superconductor-semiconductor-superconductor (S-Sm-S) structures have been proposed to be the building blocks of the next generation of topological quantum computers [1]. However, there still is a fundamental technological problem in the (i) fabrication of highly transparent interfaces between superconductors and semiconductors and (ii) scaling the number of junctions up in a single chip to realize a topological quantum device applicable for quantum technology. Here, we experimentally demonstrate an on-chip hybrid S-Sm circuit consisting of eight NbIn0.75Ga0.25As quantum wells-Nb ballistic Josephson junctions [2]. The induced hard superconducting gap in an In0.75Ga0.25As quantum well will be presented and the results of nonlinear conductance as a function of temperature and the magnetic field will be discussed. [1] V. Mourik, et al., Science 336, 1003–1007 (2012). [2] K. Delfanazari, et al., Adv. Mater. 1701836 (2017).