Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.12448 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917406596661248 |
|---|---|
| author | Kalifa, Guy Hay Kopelevitch, Dor Stern, Amir Sagi, Yoav |
| author_facet | Kalifa, Guy Hay Kopelevitch, Dor Stern, Amir Sagi, Yoav |
| contents | 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(3) 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 reveal the significant intensity-sampling systematics that plague 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12448 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Experimental Determination of the $D1$ Magic Wavelength for $^{40}$K Kalifa, Guy Hay Kopelevitch, Dor Stern, Amir Sagi, Yoav Atomic Physics Quantum Gases 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(3) 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 reveal the significant intensity-sampling systematics that plague 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. |
| title | Experimental Determination of the $D1$ Magic Wavelength for $^{40}$K |
| topic | Atomic Physics Quantum Gases |
| url | https://arxiv.org/abs/2604.12448 |