At one time I came across a Russian company that was selling JJA's based on
high-temperature superconductors (liquid nitrogen cooled). They had both JJA
chips and complete systems. They were not quite as good as the helium cooled
devices but were quite a bit cheaper and easier to work with. Apparently the
grain boundaries of the HTS material was a source of noise. I can't find the
reference to their company at the moment...
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