Enhanced qubit performance by integrating altermagnets into superconducting qubit designs
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Quantum Physics arXiv:2606.02761 (quant-ph) [Submitted on 1 Jun 2026] Title:Enhanced qubit performance by integrating altermagnets into superconducting qubit designs Authors:Johanne Bratland Tjernshaugen, Morten Amundsen, Jacob Linder View a PDF of the paper titled Enhanced qubit performance by integrating altermagnets into superconducting qubit designs, by Johanne Bratland Tjernshaugen and 2 other authors View PDF Abstract:Identifying a materials platform for creating qubits that are both tunable and resilient towards environmental noise is one of the main hurdles that need to be overcome to realize quantum computation that is practically useful. One pursued avenue to this end is to use superconducting qubits with intrinsic spin-dependent interactions, such as spin-orbit coupling or magnetism. However, the recently discovered class of materials known as altermagnets remain largely unexplored in this context. We here use microscopic calculations to determine how the properties of superconducting qubits are modified when altermagnetic Josephson junctions are included. The key qubit performance parameters, including splitting, anharmonicity, decoherence, and single/coupled-qubit gate operation times, display rich behavior depending on the characteristic properties of the altermagnetic material, such as the strength of the Néel field and the crystallographic orientation of the altermagnetic relative interfaces in the system. We focus in particular on the transmon design and show that the qubit is very well protected against decoherence and simultaneously shows superior anharmonicity both near 0-$\pi$ transition points and when it is in a $\phi$-state. We propose that by using strain, the altermagnetic qubit can be moved out of its protected regime to enable faster gate-operation times, and then moved back to its protected state. We also discuss how the altermagnetic properties influence flux qubits and fluxonium. Our results suggest that integration of altermagnetic materials into existing superconducting qubit design can substantially improve their performance due to the unique properties of the altermagnetic band-structure. Comments: Subjects: Quantum Physics (quant-ph); Superconductivity (cond-mat.supr-con) Cite as: arXiv:2606.02761 [quant-ph] (or arXiv:2606.02761v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2606.02761 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Jacob Linder [view email] [v1] Mon, 1 Jun 2026 18:25:29 UTC (680 KB) Full-text links: Access Paper: View a PDF of the paper titled Enhanced qubit performance by integrating altermagnets into superconducting qubit designs, by Johanne Bratland Tjernshaugen and 2 other authorsView PDFTeX Source view license Current browse context: quant-ph new | recent | 2026-06 Change to browse by: cond-mat cond-mat.supr-con References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)