Superconducting digital electronics

Superconducting Digital Electronics —historical Overview

この特集号のテーマは,「この 40年の各専門分野の 変遷と将来展望について」ということで引き受けたが, 筆者が研究を始めたのは 1979年であるので今年まで 続けたとしても筆者の研究期間はいささか短いことに 気がついた.40 年という年月はやっぱり長いと思う が,象徴的意味と考えて引き受けることにした. 超伝導エレクトロニクスの研究はこのころ(1975年 ごろ)から活発になってきたように思う.それは IBM が始めた,ジョセフソン素子を使ってコンピュータを 作ろうというプロジェクトが始まったからである [1]. 日本もこのころに,研究を開始している.そのころの 我が国は,IBMの動向には極めて敏感で,次世代のコ ンピュータの素子は半導体ではなく超伝導であるとい う IBMの考えは,我が国の中でも耳目を集めた.電子 技術総合研究所,電電公社,富士通,日本電気,三菱 電機の研究所で基礎的...

Ultrafast optoelectronic interface for digital superconducting electronics

The basic concepts of the ultrafast optoelectronic interface for superconducting digital electronics are presented. Several implementations of both the input optical-to-electrical and the output electrical-to-optical transducers are discussed. As an example, an optoelectronic telecommunication router is used that is capable of switching signals at a >100 Gbit s−1 rate on a single wavelength. We...

Ultrafast Optoelectronic Interface for Digital Superconducting Electronics

188 LLE Review, Volume 88 Introduction Ultrafast optoelectronics is an acknowledged field of technological importance for the 21st century, and a very large amount of research has been performed on this topic in recent years.1 It is estimated that by the year 2006 nearly 13% of developed-world households will be connected to Global Internet via interactive broadband fiber services. This require...

Niobium-Silicide Junction Technology for Superconducting Digital Electronics

We present a technology based on Nb/NbxSi1−x/Nb junctions, with barriers near the metal-insulator transition, for applications in superconducting electronics (SCE) as an alternative to Nb/AlOx/Nb tunnel junctions. Josephson junctions with co-sputtered amorphous Nb-Si barriers can be made with a wide variety of electrical properties: critical current density (Jc), capacitance (C), and normal res...

Applied Superconductivity: Josephson Effects and Superconducting Electronics