It honk that they're supposed to be free of that thermal noise because of the way the magnetic and electric fields work to have zero resistance (the whole thing

It honk that they're supposed to be free of that thermal noise because of the way the magnetic and electric fields work to have zero resistance (the whole thing would collapse if they did have thermal noise) but I don't know that I've seen anything studying it either. I suppose it might not be studied or characterized yet because of the fact that so many superconductors have required temperatures cold enough that thermal noise would be nearly impossible to measure in normal materials let alone something with no resistance otherwise.