IBM's huge, modular dilution fridge is an interesting idea for superconducting plasmon qubits [1]. I really can't help but wonder what the power consumption will be for both it at datacentre scale and also what a fundamental barrier to anything remotely "at home" that is. I've worked with dil fridges a lot. They're neither cheap nor commonplace and famously most of the world's helium has a nasty habit of leaving at the top of the atmosphere (very marginally cooling it!) as it is so light, and the sources of helium are mostly underground and collected by machines blown up in the middle east or russia recently, as a byproduct of oil and gas extraction.

Very cool technology though.

[1] https://www.ibm.com/quantum/blog/goldeneye-cryogenic-concept...