Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912914141609984 |
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| author | Ðujić, Marin Kruljac, Mateo Kardum, Lovre Šantić, Neven Aumiler, Damir Krešić, Ivor Ban, Ticijana |
| author_facet | Ðujić, Marin Kruljac, Mateo Kardum, Lovre Šantić, Neven Aumiler, Damir Krešić, Ivor Ban, Ticijana |
| contents | We experimentally study the interaction between a cold atom cloud and many longitudinal modes of a high quality Fabry-Perot cavity, by measuring signatures of collective light shifts in the cavity transmission spectrum of an optical frequency comb probe. Using a resonator coupled to more than $10^5$ intracavity atoms, we detect significant shifts of $\sim 100$ cavity modes simultaneously, which is a direct manifestation of physics beyond the hitherto explored regime of cavity-cold atom interaction with only single or few longitudinal modes at a time. For the cavity mode closest to the atomic resonance, we demonstrate a bistability in the transmission spectrum, arising due to a combined coupling of the cloud to an external pump laser and a cavity mode probed by the optical frequency comb. These results provide a first step toward deeper exploration of multifrequency cavity quantum electrodynamics, where ultrashort pulsed sources could be used for optical manipulation, cooling and entanglement of cold atoms in a resonator. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10115 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble Ðujić, Marin Kruljac, Mateo Kardum, Lovre Šantić, Neven Aumiler, Damir Krešić, Ivor Ban, Ticijana Quantum Physics Atomic Physics We experimentally study the interaction between a cold atom cloud and many longitudinal modes of a high quality Fabry-Perot cavity, by measuring signatures of collective light shifts in the cavity transmission spectrum of an optical frequency comb probe. Using a resonator coupled to more than $10^5$ intracavity atoms, we detect significant shifts of $\sim 100$ cavity modes simultaneously, which is a direct manifestation of physics beyond the hitherto explored regime of cavity-cold atom interaction with only single or few longitudinal modes at a time. For the cavity mode closest to the atomic resonance, we demonstrate a bistability in the transmission spectrum, arising due to a combined coupling of the cloud to an external pump laser and a cavity mode probed by the optical frequency comb. These results provide a first step toward deeper exploration of multifrequency cavity quantum electrodynamics, where ultrashort pulsed sources could be used for optical manipulation, cooling and entanglement of cold atoms in a resonator. |
| title | Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2505.10115 |