14 pointsby coloneltcb5 days ago2 comments

greenbita day ago
Helium can "actually remain liquid up to temperatures of 4 Kelvin, which doesn't require the extreme refrigeration technologies needed for things like transmons."
Well. I had thought liquid helium was famous for being rather extremely cold. I stand recalibrated. Now I have to go look up 'transmons'.
- rcxdudea day ago
  At a certain point it flips from 'how far below room temperature is it' to 'how close to absolute zero is it' and things get exponentially harder as you approach the limit.
PeterWhittakera day ago
> Liquid helium is also a superfluid, meaning it flows without viscosity.
No. At least not at temperatures > 2.17 K, which is where the phase change occurs. In the range (2.17..4]K, He is just a regular liquid; it is only superfluid in the range (0..2.17]K.
Hard to trust anything in the article when it gets something that fundamental that wrong.