Present and future of high-temperature superconductor quantum-based voltage standards
А.М. Клушин, J. Lesueur, Marian Kampik, F. Raso, A. Sosso, S. K. Khorshev, N. Bergeal, F. Couëdo, C. Feuillet-Palma, Paolo Durandetto, Michał Grzenik, Krzysztof Kubiczek, Krzysztof Musioł, Artur Skórkowski
Abstract
This paper presents a brief overview of the current state-of-the-art of Josephson junctions for Quantum-based Voltage Standards fabricated with High-Temperature Superconductors (HTS). A short introduction on the history and technical evolution of Low Temperature Superconductors (LTS) technology is provided for non-specialists. Then HTS technology is summarized and discussed in the context of quantum voltage standard applications. Finally, the two most promising technologies: bicrystal and Focused Helium-Ion Beam junctions are discussed with more detail, analyzing strength, limitations and perspectives in both cases.