The objective of the hybrid technology multithreaded architecture (HTMT) research is to determine the feasibility and structure of a parallel architecture integrating the combined capabilities of semiconductor, superconductor, and optical technologies. This mix of technologies may yield operational attributes superior to those based solely on semiconductor technology.
http://www.hq.nasa.gov/hpcc/petaflops/paws.96/htmt/htmt.html
http://www.hq.nasa.gov/hpcc/petaflops/paws.96/htmt/htmt.html