Japan has the world's most extensive practical experience with superconducting materials, deployed in multiple flagship projects: JT-60SA's tokamak magnets (niobium-titanium and niobium-tin), the Chuo Shinkansen maglev propulsion system (superconducting coils at -269°C), MRI systems (Hitachi, Canon Medical), and the Fugaku/FugakuNEXT quantum computing systems. Sumitomo Electric, Fujikura, and SWCC Showa are leading manufacturers of superconducting wire and tape.
Research at NIMS (National Institute for Materials Science), University of Tokyo, and Tohoku University continues to push toward higher-temperature superconductors that would reduce cooling requirements. Japan's iron-based superconductor research, initiated following the 2008 discovery of iron pnictide superconductors by Professor Hideo Hosono at Tokyo Institute of Technology, remains active with ongoing improvements to critical temperature and current density.
The practical deployment experience gives Japan a unique advantage in superconductor commercialization. While room-temperature superconductor claims generate periodic media excitement, Japan's approach focuses on incremental improvements to existing materials that enable real products — maglev trains that actually operate, fusion magnets that actually confine plasma, and quantum computers that actually compute. This pragmatic materials science tradition is Japan's core strength.