Josephson Computer Technology: An IBM Research Project
IBM Journal of Research and Development
Project This special issue of the IBM Journal of Research and Development describes the status of IBM's research project on Josephson computer technology. This first paper traces the origins and history of Josephson technology as it led to the project and outlines the project's scope. The potential of the technology for ultrahigh-performance computer mainframes is discussed and the major technological characteristics of LSI Josephson devices are examined. The paper then provides an overview
... des an overview outline of the remaining papers presented in this issue. Technology and project origins This issue is devoted entirely to IBM's Josephson Computer Technology Project, which is currently being pursued by IBM Research in Yorktown, Zurich, and East Fishkill and is aimed at demonstration of system and technological feasibility of Josephson devices for computer application. Josephson LSI digital circuits have the potential for outperforming Si and GaAs semiconductor LSI circuits in both circuit speed and overall system performance. Such devices have in fact excellent potential for the realization of reliable computer mainframes with ultrahigh performance. Josephson devices are based on superconductivity, tunneling, and the Josephson effects; they must therefore be operated at very low temperatures of about 4° above the absolute zero temperature (of -273.16°C). Superconductivity manifests itself as zero electrical resistance, which was discovered by KammerlinghOnnes  in 1911, and by its almost perfect diamagnetic behavior as first observed by Meissner and Ochsenfeld  in 1933.