Experimental Determination of the $D1$ Magic Wavelength for $^{40}$K

[2604.12448] Experimental Determination of the $D1$ Magic Wavelength for $^{40}$K Skip to main content Search Submit Donate Log in Physics > Atomic Physics arXiv:2604.12448 (physics) [Submitted on 14 Apr 2026 ( v1 ), last revised 28 Aug 2026 (this version, v2)] Title: Experimental Determination of the $D1$ Magic Wavelength for $^{40}$K Authors: Guy Hay Kalifa , Dor Kopelevitch , Amir Stern , Yoav Sagi View PDF HTML (experimental) Abstract: Neutral-atom arrays offer a promising path for quantum simulation, yet the potential of fermionic $^{40}$K remains largely constrained by state-dependent light shifts that degrade cooling and detection fidelities. This problem can be resolved by working at a magic wavelength, where the differential light shift vanishes. We report the first experimental determination of the magic wavelength for the D1 transition in fermionic $^{40}$K at 1227.54(4) nm. Using in-trap loss spectroscopy in a wavelength-tunable optical tweezer, we map the differential AC Stark shift across a range of trapping powers and wavelengths. By converting these shifts to differential scalar polarizabilities, we find excellent agreement with relativistic all-order calculations. Benchmark measurements at 1064.49 nm further quantify the intensity-sampling systematics inherent to standard trapping wavelengths, contrasting with the ``mechanically clean'' environment provided by the magic condition. Our results provide an important step toward high-fidelity in-trap D1 cooling, fluorescence imaging, and light-assisted loading, establishing a robust path toward scaling fermionic neutral-atom arrays for quantum information science. Comments: 7 pages, 5 figures Subjects: Atomic Physics (physics.atom-ph) ; Quantum Gases (cond-mat.quant-gas) Cite as: arXiv:2604.12448 [physics.atom-ph] (or arXiv:2604.12448v2 [physics.atom-ph] for this version) https://doi.org/10.48550/arXiv.2604.12448 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Yoav Sagi [ view email ] [v1] Tue, 14 Apr 2026 08:32:22 UTC (55 KB) [v2] Fri, 28 Aug 2026 04:40:11 UTC (62 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: physics.atom-ph < prev | next > new | recent | 2026-04 Change to browse by: cond-mat cond-mat.quant-gas physics References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation 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? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from (opens in new tab) (opens in new tab) (opens in new tab)

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