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Identification of Soft Modes in Amorphous Al2O3 via First-Principles
Nordita SU; Department of Physics, University of Connecticut, Storrs, CT, 06269, USA.
Nordita SU; Department of Physics, University of Connecticut, Storrs, CT, 06269, USA.
NNF Quantum Computing Programme, Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark.
NNF Quantum Computing Programme, Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark.
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2025 (English)In: Advanced Quantum Technologies, E-ISSN 2511-9044, Vol. 8, no 10, article id e2500170Article in journal (Refereed) Published
Abstract [en]

Amorphous Al2O3 is a fundamental component of modern superconducting qubits. While amorphous oxides offer distinct advantages, such as directional isotropy and a consistent bulk electronic gap, in realistic systems these compounds also support two-level systems (TLSs) which couple to the qubit, expediting decoherence. In this work, a first-principles study of amorphous Al2O3 is performed and low-energy modes are identified in the electronic and vibrational spectra as a possible origin for TLSs

Place, publisher, year, edition, pages
Wiley , 2025. Vol. 8, no 10, article id e2500170
Keywords [en]
DFT calculations, oxides, quantum computing, superconducting qubits, two-level systems
National Category
Condensed Matter Physics Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-368940DOI: 10.1002/qute.202500170ISI: 001520470900001Scopus ID: 2-s2.0-105009853041OAI: oai:DiVA.org:kth-368940DiVA, id: diva2:1992658
Note

QC 20260126

Available from: 2025-08-28 Created: 2025-08-28 Last updated: 2026-01-26Bibliographically approved

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Balatsky, Alexander V.

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