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Accelerated Characterization of Two-Level Systems in Superconducting Qubits Via Machine Learning
Nordita SU; Department of Physics, University of Connecticut, Storrs, Connecticut, USA.ORCID iD: 0009-0001-0691-0633
Nordita SU.
Nordita SU; Department of Physics, University of Connecticut, Storrs, Connecticut, USA.ORCID iD: 0000-0003-4265-1824
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. KTH, School of Engineering Sciences (SCI), Applied Physics, Light and Matter Physics. Department of Physics, University of Connecticut, Storrs, Connecticut, USA.ORCID iD: 0000-0001-6510-8870
2026 (English)In: Advanced Quantum Technologies, E-ISSN 2511-9044, Vol. 9, no 3, article id e00868Article in journal (Refereed) Published
Abstract [en]

We introduce a data-driven approach for extracting two-level system (TLS) parameters-frequency omega(TLS), coupling strength g, dissipation time T-TLS,T-1,T- and the pure dephasing time T-phi (TLS,2,) labeled as a 4 component vector q, directly from simulated spectroscopy data generated for a single TLS by a form of two-tone spectroscopy. Specifically, we demonstrate that a custom convolutional neural network model(CNN) can simultaneously predict omega(TLS), g, T-TLS,T-1 and T-phi (TLS,2) from the spectroscopy data presented in the form of images. Our results show that the model achieves superior performance to perturbation theory methods in successfully extracting the TLS parameters. Although the model, initially trained on noise-free data, exhibits a decline in accuracy when evaluated on noisy images, retraining it on a noisy dataset leads to a substantial performance improvement, achieving results comparable to those obtained under noise-free conditions. Furthermore, the model exhibits higher predictive accuracy for parameters omega TLS and g in comparison to T-TLS,1 and T-phi (TLS,2). 

Place, publisher, year, edition, pages
Wiley , 2026. Vol. 9, no 3, article id e00868
Keywords [en]
machine learning, superconducting qubits, TLS
National Category
Control Engineering Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-380079DOI: 10.1002/qute.202500868ISI: 001732131700004Scopus ID: 2-s2.0-105034139893OAI: oai:DiVA.org:kth-380079DiVA, id: diva2:2054439
Note

QC 20260421

Available from: 2026-04-21 Created: 2026-04-21 Last updated: 2026-04-21Bibliographically approved

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Balatsky, Alexander V.

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