Feedback Cooling and Thermometry of a Single Trapped Ion Using a Knife Edge
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914207189958656 |
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| author | Dang, Hans Luff, Sebastian Fischer, Martin Sondermann, Markus Leuchs, Gerd |
| author_facet | Dang, Hans Luff, Sebastian Fischer, Martin Sondermann, Markus Leuchs, Gerd |
| contents | We report on the first feedback cooling of a single trapped ion below the Doppler limit of $\hbarΓ/2 k_\mathrm{B}$. The motion of a single ion is monitored in real-time and cooled up to 9-times below the Doppler cooling temperature by applying electronic feedback. Real-time motion detection is implemented by imaging the fluorescence photons emitted by the ion onto a knife edge and detecting the transmitted light, a method used so far to cool trapped nanoparticles. The intensity modulation of the fluorescence resulting from the ion motion is used to generate and apply the feedback signal and also to determine the ion temperature. The method benefits from a high rate of detected scattered photons, which can be a challenge, and which we address by using a parabolic mirror for collecting the fluorescence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_16368 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Feedback Cooling and Thermometry of a Single Trapped Ion Using a Knife Edge Dang, Hans Luff, Sebastian Fischer, Martin Sondermann, Markus Leuchs, Gerd Quantum Physics Atomic Physics Optics We report on the first feedback cooling of a single trapped ion below the Doppler limit of $\hbarΓ/2 k_\mathrm{B}$. The motion of a single ion is monitored in real-time and cooled up to 9-times below the Doppler cooling temperature by applying electronic feedback. Real-time motion detection is implemented by imaging the fluorescence photons emitted by the ion onto a knife edge and detecting the transmitted light, a method used so far to cool trapped nanoparticles. The intensity modulation of the fluorescence resulting from the ion motion is used to generate and apply the feedback signal and also to determine the ion temperature. The method benefits from a high rate of detected scattered photons, which can be a challenge, and which we address by using a parabolic mirror for collecting the fluorescence. |
| title | Feedback Cooling and Thermometry of a Single Trapped Ion Using a Knife Edge |
| topic | Quantum Physics Atomic Physics Optics |
| url | https://arxiv.org/abs/2512.16368 |