In recent years, the development of superconductive digital electronics has been making rapid progress. A variety of digital circuits based on Single-Flux Quantum (SFQ) device technology, such as high speed digital signal processors and switching circuits for router systems, have been demonstrated and operated at a few tens GHz clock frequency. Furthermore, superconductive digital receiver systems are in field test stage. In a word, superconductive digital systems are now jumping over "The Death Valley"~*. The purpose of this Special Section is to open these excellent results to the public and to help speed practical use of these technologies. Thus we asked world famous distinguished researchers to review these technologies or to share their recent progress to the IEICE readers.
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