Scalable Single-Step Generation of W States in 2D Superconducting Qubit Lattices
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Quantum Physics arXiv:2605.18962 (quant-ph) [Submitted on 18 May 2026] Title:Scalable Single-Step Generation of W States in 2D Superconducting Qubit Lattices Authors:João H. Romeiro, Federico A. Roy, Niklas Bruckmoser, Ivan Tsitsilin, Niklas J. Glaser, Christian M. F. Schneider, Gerhard B. P. Huber, Saya A. Schöbe, Johannes Schirk, Florian Wallner, Malay Singh, Julius Feigl, Leon Koch, Lasse Södergren, Max Werninghaus, Stefan Filipp View a PDF of the paper titled Scalable Single-Step Generation of W States in 2D Superconducting Qubit Lattices, by Jo\~ao H. Romeiro and 15 other authors View PDF HTML (experimental) Abstract:The reliable generation of multi-qubit entanglement is a prerequisite for large-scale quantum information technologies. In particular, W states are a valuable resource owing to their resilience under local loss or measurement. Nevertheless, preparing these states with sequential two-qubit gates often requires substantial time overhead. By contrast, engineered simultaneous interactions enable fast entanglement generation, even in qubit systems with limited nearest-neighbour connectivity. Here, we demonstrate a set of fast and robust operations for coherently distributing a single excitation across a lattice of arbitrary size, thereby directly generating W states from initial product states. In 2D lattices, the excitation propagates along both directions simultaneously, such that the total entanglement time scales only with the largest dimension. We exploit this property to prepare a six-qubit W state in a 3$\times$2 superconducting lattice within 99 ns, achieving a tomographic fidelity of 83.9$\pm$1.0%. We then extend the protocol to create entanglement across chains of up to seven qubits, with the largest W state generated in 264 ns with a fidelity of 79.6$\pm$1.3%. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2605.18962 [quant-ph] (or arXiv:2605.18962v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2605.18962 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: João Henrique Romeiro Alves [view email] [v1] Mon, 18 May 2026 18:00:09 UTC (7,316 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalable Single-Step Generation of W States in 2D Superconducting Qubit Lattices, by Jo\~ao H. Romeiro and 15 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-05 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?)