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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 outline of the remaining papers presented in this issue.
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