Preliminary demonstration of a persistent Josephson phase-slip memory cell with topological protection

Nadia Ligato (), Elia Strambini (), Federico Paolucci () and Francesco Giazotto ()
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Nadia Ligato: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Elia Strambini: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Federico Paolucci: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Francesco Giazotto: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Superconducting computing promises enhanced computational power in both classical and quantum approaches. Yet, scalable and fast superconducting memories are not implemented. Here, we propose a fully superconducting memory cell based on the hysteretic phase-slip transition existing in long aluminum nanowire Josephson junctions. Embraced by a superconducting ring, the memory cell codifies the logic state in the direction of the circulating persistent current, as commonly defined in flux-based superconducting memories. But, unlike the latter, the hysteresis here is a consequence of the phase-slip occurring in the long weak link and associated to the topological transition of its superconducting gap. This disentangles our memory scheme from the large-inductance constraint, thus enabling its miniaturization. Moreover, the strong activation energy for phase-slip nucleation provides a robust topological protection against stochastic phase-slips and magnetic-flux noise. These properties make the Josephson phase-slip memory a promising solution for advanced superconducting classical logic architectures or flux qubits.

Date: 2021
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DOI: 10.1038/s41467-021-25209-y

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