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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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2022
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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. |
format | Online Article Text |
id | pubmed-8985919 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
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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