[avmich]

I sometimes feel sad about one particular branch of study, which could be applied to speed up computers, which was active right when the USSR was collapsing. Konstantin Likharev, among others, from Moscow State University worked on Josephson junction logical gates which demonstrated - then, 30 years ago - switching frequencies which are still out of reach for at least the mainstream CPUs (in some hundreds of gigahertz). A bit hard to find good articles about that research today - this one, https://www.beilstein-journals.org/bjnano/articles/8/269 , is an example. I've heard it failed to produce a commercial product because it was really hard to miniaturize.