Advancement of superconductor digital electronics

Abstract

Advancement of superconductor digital electronics, especially Rapid Single Flux Quantum (RSFQ) logic circuit is described. Ultra short pulse of a voltage generated across a Josephson junction and release from charging/discharging process for signal transmission in RSFQ circuits enable us to reduce power consumption and gate delay. The power-delay products (PDPs) of RSFQ integrated circuits (ICs) are 4 or 5 orders of magnitude smaller than those of semiconductor ICs. The fabrication process technology and the related designing technology have been advanced, and RSFQ ICs have been applied to software-defined radio receivers, superconductor detector array systems, and supercomputers. Recently, several kinds of energy-efficient single flux quantum circuit have been proposed to obtain further advantage to semiconductor devices. The PDPs of these circuits become at least 1 order smaller than those of conventional RSFQ circuits. Keywords: single flux quantum, superconductor, energy efficiency, high-speed, power-delay product Classification: Superconducting electronics References

Cold numbers: Superconducting supercomputers and presumptive anomaly

“…Fundamental was the Ministry of International Trade and Industry, or MITI -METI since 2001 - (Takagi et al, 2008;Fujimaki, 2012). The world realised the importance of MITI in the 1970s and 1980s, when it was very effective in promoting the Japanese hi-tech sectors by means of various tools, a constant one being carrying out and subsidising R&D on a large-scale.…”