Maybe we can build longer-range power lines that are cheaper. Buckminister Fuller thought we could use semiconductors to build a global power grid which could move energy from renewables all over the Earth. (Buzzkill: you still need to build a right-of-way for power lines and will have problems permitting. Europe has dreamed a long time of getting renewables from North Africa but Africans could well cry imperialism.)
Better particle accelerators, MRI machines, fusion reactors. (If we can greatly strengthen the magnetic field the reactor gets smaller are more economical.)
Better particle accelerators, MRI machines, fusion reactors. (If we can greatly strengthen the magnetic field the reactor gets smaller are more economical.)
Better magnetic field sensors
https://en.wikipedia.org/wiki/SQUID
Possibly better logic gates post-Silicon
https://en.wikipedia.org/wiki/Josephson_effect
https://en.wikipedia.org/wiki/Rapid_single_flux_quantum
Better magnetic levitation rail
https://en.wikipedia.org/wiki/Maglev
When I think of all those things I think the RSFQ logic gates are most likely to be revolutionary.