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On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)

Quantum information technology puts stringent demands on the quality of materials and interfaces in the pursuit of increased device coherence. Yet, little is known about the chemical structure and origins of paramagnetic impurities that produce flux/charge noise that causes decoherence of fragile qu...

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Autores principales: Un, Sun, de Graaf, Sebastian, Bertet, Patrice, Kubatkin, Sergey, Danilov, Andrey
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8985919/
https://www.ncbi.nlm.nih.gov/pubmed/35385297
http://dx.doi.org/10.1126/sciadv.abm6169
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author Un, Sun
de Graaf, Sebastian
Bertet, Patrice
Kubatkin, Sergey
Danilov, Andrey
author_facet Un, Sun
de Graaf, Sebastian
Bertet, Patrice
Kubatkin, Sergey
Danilov, Andrey
author_sort Un, Sun
collection PubMed
description Quantum information technology puts stringent demands on the quality of materials and interfaces in the pursuit of increased device coherence. Yet, little is known about the chemical structure and origins of paramagnetic impurities that produce flux/charge noise that causes decoherence of fragile quantum states and impedes the progress toward large-scale quantum computing. Here, we perform high magnetic field electron paramagnetic resonance (HFEPR) and hyperfine multispin spectroscopy on α-Al(2)O(3), a common substrate for quantum devices. In its amorphous form, α-Al(2)O(3) is also unavoidably present in aluminum-based superconducting circuits and qubits. The detected paramagnetic centers are immanent to the surface and have a well-defined but highly complex structure that extends over multiple hydrogen, aluminum, and oxygen atoms. Modeling reveals that the radicals likely originate from well-known reactive oxygen chemistry common to many metal oxides. We discuss how EPR spectroscopy might benefit the search for surface passivation and decoherence mitigation strategies.
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spelling pubmed-89859192022-04-19 On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3) Un, Sun de Graaf, Sebastian Bertet, Patrice Kubatkin, Sergey Danilov, Andrey Sci Adv Physical and Materials Sciences Quantum information technology puts stringent demands on the quality of materials and interfaces in the pursuit of increased device coherence. Yet, little is known about the chemical structure and origins of paramagnetic impurities that produce flux/charge noise that causes decoherence of fragile quantum states and impedes the progress toward large-scale quantum computing. Here, we perform high magnetic field electron paramagnetic resonance (HFEPR) and hyperfine multispin spectroscopy on α-Al(2)O(3), a common substrate for quantum devices. In its amorphous form, α-Al(2)O(3) is also unavoidably present in aluminum-based superconducting circuits and qubits. The detected paramagnetic centers are immanent to the surface and have a well-defined but highly complex structure that extends over multiple hydrogen, aluminum, and oxygen atoms. Modeling reveals that the radicals likely originate from well-known reactive oxygen chemistry common to many metal oxides. We discuss how EPR spectroscopy might benefit the search for surface passivation and decoherence mitigation strategies. American Association for the Advancement of Science 2022-04-06 /pmc/articles/PMC8985919/ /pubmed/35385297 http://dx.doi.org/10.1126/sciadv.abm6169 Text en Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Physical and Materials Sciences
Un, Sun
de Graaf, Sebastian
Bertet, Patrice
Kubatkin, Sergey
Danilov, Andrey
On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title_full On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title_fullStr On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title_full_unstemmed On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title_short On the nature of decoherence in quantum circuits: Revealing the structural motif of the surface radicals in α-Al(2)O(3)
title_sort on the nature of decoherence in quantum circuits: revealing the structural motif of the surface radicals in α-al(2)o(3)
topic Physical and Materials Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8985919/
https://www.ncbi.nlm.nih.gov/pubmed/35385297
http://dx.doi.org/10.1126/sciadv.abm6169
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