Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking
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Quantum Physics arXiv:2604.02809 (quant-ph) [Submitted on 3 Apr 2026] Title:Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking Authors:Yao-Yao Jiang, Tang Su, Yuxiang Liu, Yi-Ming Guo, Yidong Song, Yu-Long Li, Yanjie Zeng, Guang-Ming Xue, Wei-Jie Sun, Mei-Ling Li, Yi-Rong Jin, Junhua Wang, Xuegang Li, Hai-Feng Yu View a PDF of the paper titled Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking, by Yao-Yao Jiang and 13 other authors View PDF Abstract:Superconducting qubits are compelling platforms for charge-parity detection and, due to their theoretical sensitivity on the meV energy scale, hold promise for rare event searches. In this work, we realize high-fidelity mapping of charge-parity states onto qubit states using an offset-charge-tunable transmon qubit and efficiently characterize the fidelity of the charge-parity detection via randomized benchmarking. Specifically, a gate control line is applied to control offset charge, allowing us to achieve the single-qubit gate fidelity up to 99.96%. We combine a net-zero-based pulse on the gate line with a spin-echo-based sequence to realize charge-parity mapping, achieving a fidelity of 99.37%. Then, we demonstrate continuous monitoring of the charge-parity state with over 93.4% fidelity at a 4-\mu s sampling interval. Finally, an error analysis of charge-parity detection is performed, and it is found that qubit readout is currently the largest source of error. We believe this work lays the foundation for future exploration of ultra-low energy particles. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.02809 [quant-ph] (or arXiv:2604.02809v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.02809 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Xuegang Li [view email] [v1] Fri, 3 Apr 2026 07:19:47 UTC (8,004 KB) Full-text links: Access Paper: View a PDF of the paper titled Characterizing charge-parity detection based on an offset-charge-tunable transmon qubit via randomized benchmarking, by Yao-Yao Jiang and 13 other authorsView PDFTeX Source view license Current browse context: quant-ph new | recent | 2026-04 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?)