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Bias Control Field Generation for Josephson Junctions

IP.com Disclosure Number: IPCOM000085928D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Jaggi, R: AUTHOR [+2]

Abstract

For adjusting the operating point of Josephson junctions a magnetic bias field defines the threshold maximum Josephson current. Usually, it is generated by a bias current through individual control lines of the Josephson gates. To provide such a bias field to a whole array of Josephson junctions in a circuitry like a memory array, planar conductors enclose the array on top and below generating therebetween a field common to all junctions.

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Bias Control Field Generation for Josephson Junctions

For adjusting the operating point of Josephson junctions a magnetic bias field defines the threshold maximum Josephson current. Usually, it is generated by a bias current through individual control lines of the Josephson gates. To provide such a bias field to a whole array of Josephson junctions in a circuitry like a memory array, planar conductors enclose the array on top and below generating therebetween a field common to all junctions.

Perpendicular to the magnetic field H direction, a bias current I is supplied flowing through both planes which are connected together at one edge. It can be replaced by a persistent ring current if the other edge of the superconducting cage is shorted too.

That short connection can be made galvanically by connecting ground plane and cover plane at their other edge.

The superconducting ring current can be set up by an external magnetic field applied for a time. When this short is provided by some additional switchable Josephson junctions (shown by diagonal cross symbols), there is space left therebetween to facilitate other line connections to the circuitry on the ground plane. Another way of generating the persistent current, is first to apply the bias current I and then to short the loop current via the set of controllable Josephson junctions.

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