XXVI International Symposium "Nanophysics and Nanoelectronics", Nizhny Novgorod, March 14 - March 17, 2022
Superconductivity

Two-layer logic elements for classic cryogenic computers

B. A. Gurovich^a, K. E. Prikhod'ko^ab, L. V. Kutuzov^a, B. V. Goncharov^a, D. A. Komarov^a, E. M. Malieva<sup>a

a</sup> National Research Centre "Kurchatov Institute", Moscow, Russia
^b National Engineering Physics Institute "MEPhI", Moscow, Russia

Abstract: In this paper, for the first time, two-layer logic elements “NOT”, “AND”, “OR” and “NOR” were manufactured, in which the heating element of a nanowire in one layer is located in the place where the heated element of another superconductive nanowire is located in a nearest NbN layer. The film thickness of NbN (5–7 nm) was used to form of superconducting nanowires in different layers, and the thickness of Al$_2$O$_3$ (25 nm) was used as an interlayer dielectric. The paper shows the design of logic elements, and also demonstrates their operation in pulse mode. The use of multilayer structures without galvanic coupling between nanowires allows the design of multi-level logic devices.

Keywords: NbN thin superconducting films, contactless switching of the superconductor state, cryoelectronic devices, integrated cryogenic resistors, logic elements “NOT”/“AND”/“OR”/“NOR”, cryogenic computers.

Received: 29.04.2022
Revised: 29.04.2022
Accepted: 12.05.2022

DOI: 10.21883/FTT.2022.10.53079.47HH

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