Superconductor-Semiconductor Systems for Topological Quantum Computing

Semiconductor nanowires proximitized by a superconductor can exhibit topological superconducting states, which host Majorana zero modes that can be used to realize a topological quantum computer. Current experimental focus lies on demonstration of topological quantum bits, which require networks of superconductor-semiconductor systems. The speaker will describe approaches of (1) synthesizing self-assembled 1D semiconductor nanowire networks with superconductor islands, (2) processing nanostructures on epitaxial superconductor/2D electron gas systems, and (3) selective-area growth of in-plane semiconductor nanowire networks with in situ superconductors. Furthermore, ongoing efforts on improving the materials systems by higher electron mobility, stronger spin-orbit coupling, and higher superconducting transition temperature will be discussed. These advances in the low-dimensional superconductor-semiconductor systems may realize scalable Majorana networks toward topological quantum computing.