Quantum computers run at 10 Millikelvin
Discussion
A useful quantum computer can never exist. Prove me wrong.
Only if you present this challenge in the officially recognised, international standard meme ๐
Challenge accepted!

Oh shit ๐
Does D-Wave count?
Key word is useful. By that I mean a computer that can perform operations infeasible for conventional computers.
D Wave looks like bull to me. I donโt believe it. I want to see a real demonstration of Shorโs algorithm factorising large numbers. Simulating materials sounds like just making stuff up.
There are drugs on the market that are a direct result of the computational results from these machines.
It looks like AI can do similar things (AlphaFold), but perhaps not exactly the same.
I donโt believe these are tasks that are done with quantum computation. More like randomness mixed with some kind of goal seeking, but Iโm just guessing (and so are they).
Only if you present this challenge in the officially recognised, international standard meme ๐