There's quite a large effort in superconducting qubits, superconducting quantum limited amplifiers, at least one company doing rapid single flux quantum circuitry. Superconducting circuits are reasonably popular.
Wow, that's neat! Has any of this technology made it out of the lab?
It feels like the main limit to mass production of this technology (if people wanted it) is the cryogenics system involved. What other barriers (other than lack of demand) are there to, say, placing a superconducting device in a mass-market product?
