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Tbh, this isn't really that new of an idea. Quantum computing requires temperatures less than 3 Kelvin. It doesn't matter how efficient your processor is, getting anything down to that temperature requires a lot of cooling equipment, so much that it's utterly impractical for general use.
It's kinda like analogue computing, aka comuting with analogue signals instead of digital. You're able to solve problems extremely fast, on par with (if not superior to) quantum computing. The downside is that the circuits have to be custom designed for the use case, making it impractical for most tasks.
At the time people thought that you might build new supercomputers with an on-site cryostat (or something like that) housing a bunch of QPUs.