Qubits are getting smaller at the same time their coherence times are getting longer. The millions of qubits figure assumes pretty crappy coherence times. I don’t see any reason why you wouldn’t fit a future QPU on a 4 inch wafer or some kind of stack of them.
Finally, again, dil fridges are a solved problem. Not only are they solved but there’s a ton of room for improvement. They’re very inefficient. You can just make bigger ones with more dil units.
That leaves the wiring, but you remove a lot of that with cryosilicon computers and multiplexers.
Finally, again, dil fridges are a solved problem. Not only are they solved but there’s a ton of room for improvement. They’re very inefficient. You can just make bigger ones with more dil units.
That leaves the wiring, but you remove a lot of that with cryosilicon computers and multiplexers.