High-gap Josephson junctions for single-film superconducting qubits

This talk reports recent experiments aimed at creating Josephson junctions and their associated superconducting qubits based on constrictions in high-gap superconducting thin films rather than conventional barrier oxides. Our goal is to create fabrication-friendly superconducting qubits from a single material, harnessing the properties of its intrinsic electronic phases, and operating at elevated temperature. The talk will discuss design considerations for constriction-based qubits and present preliminary measurements on junctions fabricated in a single lithographic step without shadow evaporation. These results indicate a promising path towards high-gap single-film superconducting qubits for operation at super-Kelvin temperature and frequencies above 20GHz.