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Circuits-- Challenges and Opportunities

In spite of the rather large investment in research in superconducting electronics in the U.S. and Japan and elsewhere, there has been remarkably little payoff in terms of practical applications. By "practical applications" I mean products which are used by others outside the superconducting electronics community for their own purposes, without a primary interest in how the superconducting device works. By "electronics" I mean active electron devices, excluding passive conductors, filters, etc.