Qubit Noise Sensing via Induced Photon Loss in a High-Quality Superconducting Cavity
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Quantum Physics arXiv:2603.06848 (quant-ph) [Submitted on 6 Mar 2026] Title:Qubit Noise Sensing via Induced Photon Loss in a High-Quality Superconducting Cavity Authors:Nitzan Kahn, Dror Garti, Uri Goldblatt, Lalit M. Joshi, Fabien Lafont, Serge Rosenblum View a PDF of the paper titled Qubit Noise Sensing via Induced Photon Loss in a High-Quality Superconducting Cavity, by Nitzan Kahn and 5 other authors View PDF HTML (experimental) Abstract:Characterizing the noise affecting superconducting qubits is essential for improving their performance. Existing noise-sensing techniques use the qubit itself as a detector, but its short coherence time limits both sensitivity and accessible frequency range. Here, we demonstrate a method for measuring qubit frequency noise by converting it into photon loss in a coupled high-quality superconducting cavity. We prepare a single photon in the cavity and perform repeated mid-circuit qubit measurements with post-selection to isolate noise-induced loss from intrinsic cavity decay, placing an upper bound on the intrinsic dressed-dephasing rate of $(0.29 \, \mathrm{s})^{-1}$ at 508 MHz, corresponding to a qubit frequency-noise power spectral density below $5.4\times10^3\,\mathrm{Hz}^2/\,\mathrm{Hz}$. By exploiting the cavity's millisecond-scale lifetime, this technique provides access to high-frequency noise processes that are beyond the reach of conventional qubit-based spectroscopy and that may impose previously unexplored limits on qubit coherence. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.06848 [quant-ph] (or arXiv:2603.06848v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2603.06848 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Serge Rosenblum [view email] [v1] Fri, 6 Mar 2026 20:14:15 UTC (554 KB) Full-text links: Access Paper: View a PDF of the paper titled Qubit Noise Sensing via Induced Photon Loss in a High-Quality Superconducting Cavity, by Nitzan Kahn and 5 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-03 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?) Links to Code Toggle Papers with Code (What is Papers with Code?) 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?)