A bifunctional superconducting cell as flux qubit and neuron

Dmitrii S Pashin; Pavel V Pikunov; Marina V Bastrakova; Andrey E Schegolev; Nikolay V Klenov; Igor I Soloviev

doi:10.3762/bjnano.14.92

A bifunctional superconducting cell as flux qubit and neuron

Beilstein J Nanotechnol. 2023 Nov 21:14:1116-1126. doi: 10.3762/bjnano.14.92. eCollection 2023.

Authors

Dmitrii S Pashin¹, Pavel V Pikunov¹, Marina V Bastrakova^{1

2}, Andrey E Schegolev^{3

4}, Nikolay V Klenov^{5

6}, Igor I Soloviev^{3

6}

Affiliations

¹ Faculty of Physics, Lobachevsky State University of Nizhni Novgorod, 603022 Nizhny Novgorod, Russia.
² Russian Quantum Center, 143025 Skolkovo, Moscow, Russia.
³ Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
⁴ Moscow Technical University of Communication and Informatics (MTUCI), 111024 Moscow, Russia.
⁵ Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
⁶ National University of Science and Technology MISIS, 119049 Moscow, Russia.

Abstract

Josephson digital or analog ancillary circuits are an essential part of a large number of modern quantum processors. The natural candidate for the basis of tuning, coupling, and neromorphic co-processing elements for processors based on flux qubits is the adiabatic (reversible) superconducting logic cell. Using the simplest implementation of such a cell as an example, we have investigated the conditions under which it can optionally operate as an auxiliary qubit while maintaining its "classical" neural functionality. The performance and temperature regime estimates obtained confirm the possibility of practical use of a single-contact inductively shunted interferometer in a quantum mode in adjustment circuits for q-processors.

Keywords: Josephson junctio; adiabatic logic cell; flux qubit; quantum neuron; quantum parametron; superconducting quantum computers; superconducting quantum interferometer.

Grants and funding

The development of the method of analysing the evolution of observables for the adiabatic logic cells in quantum mode was carried out with the support of the Grant of the Russian Science Foundation No. 22-72-10075. The development of the main concept was carried out with the financial support of the Strategic Academic Leadership Programme “Priority-2030” (grant from NITU “MISIS” No. K2-2022-029). A.S. is grateful to the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS” (grant 22-1-3-16-1).