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Proceedings of the IEEE

The flux shuttle—A Josephson junction shift register employing single flux quanta

T. A. Fulton, R. C. Dynes, Philip Warren Anderson

Published Jan 1, 1973• 132 citations
Publisher

Abstract

A shift register is described which employs as information bits the flux quantum vortices occurring in Josephson junctions of extended dimensions. The positions of the vortices can be controlled and manipulated by an appropriately designed circuit geometry and by application of currents and magnetic fields. The time required for switching of the position of a vortex can approach the period of the Josephson plasma oscillation (∼10 ps) and the intrinsic energy dissipation is typically ≲ 10-18J/shift.

DOI
10.1109/proc.1973.8966

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IEEE Transactions on Applied Superconductivity•Jan 1, 1991•3 citations
A shift register is described which employs as information bits the flux quantum vortices occurring in Josephson junctions of extended dimensions. The positions of the vortices can be controlled and manipulated by an appropriately designed circuit geometry and by application of currents and magnetic fields. The time required for switching of the position of a vortex can approach the period of the Josephson plasma oscillation (∼10 ps) and the intrinsic energy dissipation is typically ≲ 10-18J/shift.
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A general method for calculating the mode boundaries of a uniform flux shuttle and numerical techniques for computing these thresholds are presented. A number of examples of practical interest are given, including the current distribution in a shuttle due to a single vortex, and static margins of directly injected two-phase shift registers and magnetically clocked three-phase shift registers. Comparison with dynamic circuit simulations shows that the static thresholds are good approximations over a wide range of junction parameters.>