Do you realize all those are wishes, not plausible technology right now? Fusion power has more problems than just magnets needed to be kept cold. MRI machines are a niche thing, sure they could get cheaper but why should average Joe care? Computers don't get just magically faster. Computers need semiconductor switches and those operate based on energy dissipation, you can't just remove that and get a better computer. Maglev trains are overpriced gimmick and lossless transmission would be nice but current estimate of energy losses is like 5%, negligible part of the cost.
> It's a holy grail technology.
In the sense lots of people talk about it as something important, but it is never actually seen or used.
Computers would get magically faster, though. You can build standard digital circuits out of superconducting Josephson junctions, which have much higher switching speeds than semiconductor transistors. A flip-flop was demonstrated to operate at 770 GHz.
Josephson junction is a very interesting device with many uses, including low energy consumption per FLOPS.
But one big part of the reason the consumption is so low is low temperature. When you try it with room temperatures, switching energy will go up by 2 orders of magnitude (due to higher thermal noise) and this makes the JJ computer efficiency only somewhat better than CMOS. I agree this would still be interesting as refrigeration can be much simpler then and researching JJ-based computers would be easier.
But if we talk about best power/watt, the 4.2K systems or 77K systems are likely to be better than room temp superconducting computers.
"A flip-flop was demonstrated to operate at 770 GHz."
That's data, but not information - flip-flop Hz is far higher than the processor's Hz (which basically has to synchronise over billions of different circuits and run at the lowest common denominator) - so your figure can't be compared to a normal processor's clock speed, only a normal flip flop's speed.
Anyone know what a normal flip flop's speed runs at?
> It's a holy grail technology.
In the sense lots of people talk about it as something important, but it is never actually seen or used.