[zahlman]

> you could use familiar semiconductor manufacturing processes.

Unclear to me why that's helpful. Materials that superconduct at a higher temperature than this one aren't hard to come by, or obscure:

> In 1913, lead was found to superconduct at 7 K,

[lazide]

Probably because they don’t behave well for normal lithography techniques? The high temp superconductors I know of are weird meta materials, and good luck getting them to exist in chip form at all.