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    "title": "Remote sympathetic cooling of a trapped proton through a superconducting circuit",
    "summary": "Bohman and the BASE team sympathetically cooled a single proton by coupling it through a superconducting resonant circuit to laser-cooled beryllium ions in a separate Penning trap about nine centimetres away. Frequency spectra and controlled remote heating demonstrated energy exchange. Measurements of energy-dependent proton frequency shifts then showed a temperature reduction reaching 14.4±0.7 kelvin, relative to an effective circuit-noise temperature near 17 kelvin. The experiment extended sympathetic cooling beyond direct short-range Coulomb coupling.",
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    "year": 2021,
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      "J. A. Devlin",
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        "title": "Sympathetic cooling of a trapped proton mediated by an LC circuit (Nature-layout reproduction deposited as arXiv2108.12725v1)",
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            "citation": "Sympathetic cooling of a trapped proton mediated by an LC circuit (Nature-layout reproduction deposited as arXiv2108.12725v1)",
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        "description": "The experiment measured the proton’s axial mode using calibrated, model-dependent frequency shifts. The quoted absolute final temperature, 2.6±2.5 kelvin, has much larger uncertainty than the temperature reduction. Other motional modes, antiproton cooling, ground-state preparation and improved fundamental-constant measurements were proposed extensions. The macroscopic circuit mode and trapped-particle motion were cooled; this does not mean the whole apparatus reached the inferred particle temperature.",
        "domain": "Atomic and fundamental physics / remote ion cooling"
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      "sources": [
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      "statement": "# Remote sympathetic cooling of a trapped proton through a superconducting circuit\n\nBohman and the BASE team sympathetically cooled a single proton by coupling it through a superconducting resonant circuit to laser-cooled beryllium ions in a separate Penning trap about nine centimetres away. Frequency spectra and controlled remote heating demonstrated energy exchange. Measurements of energy-dependent proton frequency shifts then showed a temperature reduction reaching 14.4±0.7 kelvin, relative to an effective circuit-noise temperature near 17 kelvin. The experiment extended sympathetic cooling beyond direct short-range Coulomb coupling.\n\n## Scientific scope\n\nThe experiment measured the proton’s axial mode using calibrated, model-dependent frequency shifts. The quoted absolute final temperature, 2.6±2.5 kelvin, has much larger uncertainty than the temperature reduction. Other motional modes, antiproton cooling, ground-state preparation and improved fundamental-constant measurements were proposed extensions. The macroscopic circuit mode and trapped-particle motion were cooled; this does not mean the whole apparatus reached the inferred particle temperature.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nM. Bohman; V. Grunhofer; C. Smorra; M. Wiesinger; C. Will; M. J. Borchert; J. A. Devlin; S. Erlewein; M. Fleck; S. Gavranovic; J. Harrington; B. Latacz; A. Mooser; D. Popper; E. Wursten; K. Blaum; Y. Matsuda; C. Ospelkaus; W. Quint; J. Walz; S. Ulmer\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Sympathetic cooling of a trapped proton mediated by an LC circuit (Nature-layout reproduction deposited as arXiv2108.12725v1)](https://arxiv.org/pdf/2108.12725v1)\n",
      "summary": "Bohman and the BASE team sympathetically cooled a single proton by coupling it through a superconducting resonant circuit to laser-cooled beryllium ions in a separate Penning trap about nine centimetres away. Frequency spectra and controlled remote heating demonstrated energy exchange. Measurements of energy-dependent proton frequency shifts then showed a temperature reduction reaching 14.4±0.7 kelvin, relative to an effective circuit-noise temperature near 17 kelvin. The experiment extended sympathetic cooling beyond direct short-range Coulomb coupling.",
      "title": "Remote sympathetic cooling of a trapped proton through a superconducting circuit"
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    "title": "Remote sympathetic cooling of a trapped proton through a superconducting circuit",
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    "what_changed": "Bohman and the BASE team sympathetically cooled a single proton by coupling it through a superconducting resonant circuit to laser-cooled beryllium ions in a separate Penning trap about nine centimetres away. Frequency spectra and controlled remote heating demonstrated energy exchange. Measurements of energy-dependent proton frequency shifts then showed a temperature reduction reaching 14.4±0.7 kelvin, relative to an effective circuit-noise temperature near 17 kelvin. The experiment extended sympathetic cooling beyond direct short-range Coulomb coupling.",
    "scope": "Bohman and the BASE team sympathetically cooled a single proton by coupling it through a superconducting resonant circuit to laser-cooled beryllium ions in a separate Penning trap about nine centimetres away. Frequency spectra and controlled remote heating demonstrated energy exchange. Measurements of energy-dependent proton frequency shifts then showed a temperature reduction reaching 14.4±0.7 kelvin, relative to an effective circuit-noise temperature near 17 kelvin. The experiment extended sympathetic cooling beyond direct short-range Coulomb coupling. The experiment measured the proton’s axial mode using calibrated, model-dependent frequency shifts. The quoted absolute final temperature, 2.6±2.5 kelvin, has much larger uncertainty than the temperature reduction. Other motional modes, antiproton cooling, ground-state preparation and improved fundamental-constant measurements were proposed extensions. The macroscopic circuit mode and trapped-particle motion were cooled; this does not mean the whole apparatus reached the inferred particle temperature.",
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