Magnetic flux noise in superconducting qubits and the gap states continuum

Abstract In the present study we investigate the selected local aspects of the metal-induced gap states (MIGSs) at the disordered metal–insulator interface, that were previously proposed to produce magnetic moments responsible for the magnetic flux noise in some of the superconducting qubit modaliti...

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Autores principales:	Dominik Szczęśniak, Sabre Kais
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ca52d912438a42bb9d0aa701f43af9a2
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spelling	oai:doaj.org-article:ca52d912438a42bb9d0aa701f43af9a22021-12-02T13:48:53ZMagnetic flux noise in superconducting qubits and the gap states continuum10.1038/s41598-021-81450-x2045-2322https://doaj.org/article/ca52d912438a42bb9d0aa701f43af9a22021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81450-xhttps://doaj.org/toc/2045-2322Abstract In the present study we investigate the selected local aspects of the metal-induced gap states (MIGSs) at the disordered metal–insulator interface, that were previously proposed to produce magnetic moments responsible for the magnetic flux noise in some of the superconducting qubit modalities. Our analysis attempts to supplement the available studies and provide new theoretical contribution toward their validation. In particular, we explicitly discuss the behavior of the MIGSs in the momentum space as a function of the onsite energy deviation, that mimics random potential disorder at the interface in the local approximation. It is found, that when the difference between the characteristic electronic potentials in the insulator increases, the corresponding MIGSs become more localized. This effect is associated with the increasing degree of the potential disorder that was earlier observed to produce highly localized MIGSs in the superconducting qubits. At the same time, the presented findings show that the disorder-induced localization of the MIGSs can be related directly to the decay characteristics of these states as well as to the bulk electronic properties of the insulator. As a result, our study reinforces plausibility of the previous corresponding investigations on the origin of the flux noise, but also allows to draw future directions toward their better verification.Dominik SzczęśniakSabre KaisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dominik Szczęśniak Sabre Kais Magnetic flux noise in superconducting qubits and the gap states continuum
description	Abstract In the present study we investigate the selected local aspects of the metal-induced gap states (MIGSs) at the disordered metal–insulator interface, that were previously proposed to produce magnetic moments responsible for the magnetic flux noise in some of the superconducting qubit modalities. Our analysis attempts to supplement the available studies and provide new theoretical contribution toward their validation. In particular, we explicitly discuss the behavior of the MIGSs in the momentum space as a function of the onsite energy deviation, that mimics random potential disorder at the interface in the local approximation. It is found, that when the difference between the characteristic electronic potentials in the insulator increases, the corresponding MIGSs become more localized. This effect is associated with the increasing degree of the potential disorder that was earlier observed to produce highly localized MIGSs in the superconducting qubits. At the same time, the presented findings show that the disorder-induced localization of the MIGSs can be related directly to the decay characteristics of these states as well as to the bulk electronic properties of the insulator. As a result, our study reinforces plausibility of the previous corresponding investigations on the origin of the flux noise, but also allows to draw future directions toward their better verification.
format	article
author	Dominik Szczęśniak Sabre Kais
author_facet	Dominik Szczęśniak Sabre Kais
author_sort	Dominik Szczęśniak
title	Magnetic flux noise in superconducting qubits and the gap states continuum
title_short	Magnetic flux noise in superconducting qubits and the gap states continuum
title_full	Magnetic flux noise in superconducting qubits and the gap states continuum
title_fullStr	Magnetic flux noise in superconducting qubits and the gap states continuum
title_full_unstemmed	Magnetic flux noise in superconducting qubits and the gap states continuum
title_sort	magnetic flux noise in superconducting qubits and the gap states continuum
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/ca52d912438a42bb9d0aa701f43af9a2
work_keys_str_mv	AT dominikszczesniak magneticfluxnoiseinsuperconductingqubitsandthegapstatescontinuum AT sabrekais magneticfluxnoiseinsuperconductingqubitsandthegapstatescontinuum
_version_	1718392465040343040

Magnetic flux noise in superconducting qubits and the gap states continuum

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