Superconducting coaxial cables, Coax Co, Yokohama

Between the 4 K stage and the few-millikelvin stage, microwaves must be carried without transporting heat: hence niobium-titanium coaxes with very low thermal conduction, a niche dominated by a few Japanese makers. A discreet component but with no immediate substitute, dependent on NbTi wire and a rare connectorisation know-how.