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High Gain Josephson Interferometer

IP.com Disclosure Number: IPCOM000082895D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Schulz DuBois, EO: AUTHOR

Abstract

For obtaining high gain the control line has to pass the Josephson junction in two windings. Normally this requires a ground contact or a jumper, drawing A. Such a device is difficult to make and consumes considerable space, e.g., in matrix configurations.

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High Gain Josephson Interferometer

For obtaining high gain the control line has to pass the Josephson junction in two windings. Normally this requires a ground contact or a jumper, drawing A. Such a device is difficult to make and consumes considerable space, e.g., in matrix configurations.

Drawing B shows an interferometer layout achieving the same effect, by a junction between two overlapping but displaced loops and a meander shaped control line. The control line may be viewed as a flattened transformer coil with two windings. Folding the paper along lines a a' and b b' will make the "winding" apparent. Whereas other interferometer embodiments usually have two inductive branches connecting both Josephson junctions, the proposed embodiment has four which are pair-wise in parallel.

Drawing C shows the embodiment of the proposed scheme in a three- junction interferometer with the center junction divided into two.

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