Importance

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Abstract

A circuit element for a superconducting integrated circuit is disclosed which comprises a plurality of Josephson junctions stacked vertically atop one another. Such a circuit element is capable of replacing single junctions and lateral arrays of junctions in many analog and digital applications. When operated digitally, the close proximity of the junctions to one another creates a 'tight coupling' effect which permits the entire stack to switch as a single junction. Input (control) currents and output (bias) currents can be injected or taken out at any level or levels in the stack, thereby permitting excellent isolation, voltage gain, and the use of a single stack as a combination logic element. The use of tight coupling is extendable to lateral arrays as well. A method by which a circuit including vertical tunnel junctions may be fabricated is also disclosed.

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First Claim