In electronics, information has been traditionally stored, processed and communicated using an electron's charge. This paradigm is increasingly turning out to be energy-inefficient, because movement of charge within an information-processing device invariably causes current flow and an associated dissipation. Replacing charge with the "spin" of an electron to encode information may eliminate much of this dissipation and lead to more energy-efficient "green electronics". This realization has spurred significant research in spintronic devices and circuits where spin either directly acts as the physical variable for hosting information or augments the role of charge. In this review article, we discuss and elucidate some of these ideas, and highlight their strengths and weaknesses. Many of them can potentially reduce energy dissipation significantly, but unfortunately are error-prone and unreliable. Moreover, there are serious obstacles to their technological implementation that may be difficult to overcome in the near term.
This review addresses three constructs: (1) single devices or binary switches that can be constituents of Boolean logic gates for digital information processing, (2) complete gates that are capable of performing specific Boolean logic operations, and (3) combinational circuits or architectures (equivalent to many gates working in unison) that are capable of performing universal computation.
Universal logic circuit for gate-controlled superconductor-based switches operating at liquid-helium temperatures
Budapest University of Technology and Economics（布达佩斯技术与经济大学）；MTA-BME Superconducting Nanoelectronics Momentum Research Group（MTA-BME超导纳米电子动量研究组）；Aalto University School of Science（阿尔托大学理学院）；Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research（匈牙利研究与创新网络能源研究中心技术物理与材料科学研究所）；MTA-BME Correlated van der Waals Structures Momentum Research Group（MTA-BME关联范德华结构动量研究组）
