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Nonlinear Josephson Junctions with Reduced Resonance Amplitudes

IP.com Disclosure Number: IPCOM000079064D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Jutzi, WW: AUTHOR

Abstract

Large nonlinear Josephson junctions with strongly reduced resonance amplitudes, yet operable with small-current densities, are desirable to increase the operation margins of logic and memory circuits.

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Nonlinear Josephson Junctions with Reduced Resonance Amplitudes

Large nonlinear Josephson junctions with strongly reduced resonance amplitudes, yet operable with small-current densities, are desirable to increase the operation margins of logic and memory circuits.

The external boundary of at least one of the electrodes of a Josephson junction is given in ripple shape, so as to reduce the quality factor of first- resonance frequency, and to reduce the coupling length between the Josephson wave and the electromagnetic wave in the junction cavity.

Reduction of higher-order resonance amplitudes is possible by giving especially the bottom electrode a grid-like structure, thus connecting a large number of small subjunctions in parallel and/or in series. The maximum metal length between any two holes in the direction perpendicular to the external control fields, is to be smaller than half the electromagnetic wavelength of the frequence at half the gap voltage V(g). This metal length may vary along the junction.

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