Turquoise Magic Wavelength of the ${}^{87}$Sr Clock Transition
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908968632188928 |
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| author | Kestler, G. Sedlik, R. J. Trapp, E. C. Safronova, M. S. Barreiro, J. T. |
| author_facet | Kestler, G. Sedlik, R. J. Trapp, E. C. Safronova, M. S. Barreiro, J. T. |
| contents | Optical lattice clocks of fermionic strontium offer a versatile platform for probing fundamental physics and developing quantum technologies. The bivalent electronic structure of strontium gives rise to a doubly-forbidden atomic transition that is accessible due to hyperfine mixing in fermionic strontium-87, thus resulting in a sub-millihertz natural linewidth. Currently, the most accurate optical lattice clocks operate on this narrow transition by tightly trapping strontium-87 atoms in a {\em magic} optical lattice at 813~nm. {\em Magic} wavelengths occur where the Stark shifts of both the ground and excited states are equivalent, thus eliminating any position and intensity-dependent broadening of the corresponding transition. Theoretical calculations of the electronic structure of strontium-87 have also predicted another {\em magic} wavelength of the clock transition at 497.01(57)~nm. In this work, we experimentally measure the novel {\em magic} wavelength to be $497.4363(3)$~nm. Compared to the 813~nm {\em magic} wavelength, 497~nm is closer to the strong 461~nm dipolar transition of strontium, resulting in larger atomic polarizability by an order of magnitude, providing deeper traps with less optical power. The proximity to the 461~transition also leads to an enhanced sensitivity of 334(10)~Hz/(nm\,$E_{R}$) at the {\em magic} wavelength. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Turquoise Magic Wavelength of the ${}^{87}$Sr Clock Transition Kestler, G. Sedlik, R. J. Trapp, E. C. Safronova, M. S. Barreiro, J. T. Atomic Physics Quantum Gases Quantum Physics Optical lattice clocks of fermionic strontium offer a versatile platform for probing fundamental physics and developing quantum technologies. The bivalent electronic structure of strontium gives rise to a doubly-forbidden atomic transition that is accessible due to hyperfine mixing in fermionic strontium-87, thus resulting in a sub-millihertz natural linewidth. Currently, the most accurate optical lattice clocks operate on this narrow transition by tightly trapping strontium-87 atoms in a {\em magic} optical lattice at 813~nm. {\em Magic} wavelengths occur where the Stark shifts of both the ground and excited states are equivalent, thus eliminating any position and intensity-dependent broadening of the corresponding transition. Theoretical calculations of the electronic structure of strontium-87 have also predicted another {\em magic} wavelength of the clock transition at 497.01(57)~nm. In this work, we experimentally measure the novel {\em magic} wavelength to be $497.4363(3)$~nm. Compared to the 813~nm {\em magic} wavelength, 497~nm is closer to the strong 461~nm dipolar transition of strontium, resulting in larger atomic polarizability by an order of magnitude, providing deeper traps with less optical power. The proximity to the 461~transition also leads to an enhanced sensitivity of 334(10)~Hz/(nm\,$E_{R}$) at the {\em magic} wavelength. |
| title | Turquoise Magic Wavelength of the ${}^{87}$Sr Clock Transition |
| topic | Atomic Physics Quantum Gases Quantum Physics |
| url | https://arxiv.org/abs/2506.18958 |