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Physica C Superconductivity

Superconductive combinational logic circuit using magnetically coupled SQUID array

Yuki Yamanashi, K. Umeda, K. Sai

Published May 18, 2010• 1 citation
Publisher
DOI
10.1016/j.physc.2010.05.158

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We describe a technique for fabricating magnetically coupled Josephson logic and memory circuits and SQUIDs which uses only two superconducting layers. These two layers perform multiple functions as the base and counterelectrodes of the tunnel junctions, the SQUID inductance and control lines, and the signal lines and groundplane between gates. This technique is illustrated by the specific example of a two junction, resistively damped SQUID designed to be fabricated using an all-refractory process which employs a total of five masking levels.
Large arrays of superconducting radiation sensors require a multiplexed readout. One implementation of the promising code division multiplexing technique uses current steering switches (CSSs) based on superconducting quantum interference devices (SQUIDs). We pursue the concept of utilizing rapid single flux quantum (RSFQ) electronics to control these switches, where each SQUID of a CSS is inductively coupled to the storing loop of a delay flip-flop. The internal state of this digital logic element is represented by the presence of a magnetic flux quantum, which is destined to control the CSS.