Goto Eiichi Goto – författare

This book concerns a Josephson device for supercomputers which has extremely low heat dissipation (about 106 times less than semiconductor devices and 103 times less than voltage-based Josephson devices). In the previous book on Quantum Flux Parametrons (QFPs), DC Flux Parametron, the basic device operation are described. This book deals in much greater depth on the problems which are faced by the QFP. The device characteristics are worked out in detail showing clearly the analysis methods used. A new logic gate using the QFP is described with respect to its basic scheme, operation, and ways for forming logic circuits. The problems faced by the basic QFP are much reduced in the new logic gate. As the QFP operates near the Heisenberg and Boltzmann limits for computing devices, we also show the relationship between speed and stability. The book contains the latest analytical results on QFPs.The material presented in the book can be understood with very little mathematical training or knowledge about superconducting physics. It is also self-contained and does not require reading of other material. Most of the device characteristics can be reproduced from the equations given using simple programs. A circuit simulator is not needed except for high speeds when transient behavior becomes important.

The direct current flux parametron using Josephson junction and based on the principle of parametron seems to be the answer for the search of new technology for the future needs of computer power. The combination of its very high switching speed and highly integrable Josephson junction with the established parametron computer technology accounts for its high performance. This book presents the new type of Josephson computer technology which is fundamentally different from the conventional approach. In this approach, a logic state is represented by a flux polarity whereas the conventional approach uses a voltage state to represent a logic state.

This volume reports new developments on work in the Quantum Flux Parametron (QFP) project. It makes complete a series on Josephson Supercomputers, which includes four earlier volumes, also published by World Scientific. QFP technology has great potential especially in the design of computer architecture. It is regarded as being able to go beyond the horizon of current technology, and is a leading direction for the advancement of computer technology in the next decade.