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        "description": "Subthermal preparation selects low-energy outcomes from repeated thermalization with an approximately four-kelvin circuit; it does not cool that entire bath to 200 millikelvin or establish the ground state of every motional mode. Spin-identification error estimates depend on thresholds and fitted noise distributions. This paper demonstrated preparation and incoherent spin-transition readout, while stronger magnetic-moment precision, coherent antiproton control and complete matter–antimatter symmetry tests require further experiments.",
        "domain": "Fundamental physics / trapped antimatter and precision spectroscopy"
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      "statement": "# Fast subthermal cyclotron preparation and improved antiproton spin readout\n\nLatacz and the BASE team implemented a double-Penning-trap procedure that repeatedly thermalizes an antiproton’s modified cyclotron motion and measures its energy, stopping when a cold state is found. They reported preparation below an energy-equivalent temperature of 200 millikelvin in about 500 seconds, with a measured thermalization time constant of 4.7±0.4 seconds. A colder prepared antiproton showed clearly separated spin-transition signals, improving nondestructive spin-state identification.\n\n## Scientific scope\n\nSubthermal preparation selects low-energy outcomes from repeated thermalization with an approximately four-kelvin circuit; it does not cool that entire bath to 200 millikelvin or establish the ground state of every motional mode. Spin-identification error estimates depend on thresholds and fitted noise distributions. This paper demonstrated preparation and incoherent spin-transition readout, while stronger magnetic-moment precision, coherent antiproton control and complete matter–antimatter symmetry tests require further experiments.\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\nB. M. Latacz; M. Fleck; J. I. Jäger; G. Umbrazunas; B. P. Arndt; S. R. Erlewein; E. J. Wursten; J. A. Devlin; P. Micke; F. Abbass; D. Schweitzer; M. Wiesinger; C. Will; H. Yildiz; K. Blaum; Y. Matsuda; A. Mooser; C. Ospelkaus; C. Smorra; A. Soter; W. Quint; J. Walz; Y. Yamazaki; 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- [Orders of Magnitude Improved Cyclotron-Mode Cooling for Non-Destructive Spin Quantum Transition Spectroscopy with Single Trapped Antiprotons (arXiv2404.07928v1)](https://arxiv.org/pdf/2404.07928v1)\n",
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      "title": "Fast subthermal cyclotron preparation and improved antiproton spin readout"
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    "achievement_state": "SUPPORTED_SCOPED_RESULT",
    "what_changed": "Latacz and the BASE team implemented a double-Penning-trap procedure that repeatedly thermalizes an antiproton’s modified cyclotron motion and measures its energy, stopping when a cold state is found. They reported preparation below an energy-equivalent temperature of 200 millikelvin in about 500 seconds, with a measured thermalization time constant of 4.7±0.4 seconds. A colder prepared antiproton showed clearly separated spin-transition signals, improving nondestructive spin-state identification.",
    "scope": "Latacz and the BASE team implemented a double-Penning-trap procedure that repeatedly thermalizes an antiproton’s modified cyclotron motion and measures its energy, stopping when a cold state is found. They reported preparation below an energy-equivalent temperature of 200 millikelvin in about 500 seconds, with a measured thermalization time constant of 4.7±0.4 seconds. A colder prepared antiproton showed clearly separated spin-transition signals, improving nondestructive spin-state identification. Subthermal preparation selects low-energy outcomes from repeated thermalization with an approximately four-kelvin circuit; it does not cool that entire bath to 200 millikelvin or establish the ground state of every motional mode. Spin-identification error estimates depend on thresholds and fitted noise distributions. This paper demonstrated preparation and incoherent spin-transition readout, while stronger magnetic-moment precision, coherent antiproton control and complete matter–antimatter symmetry tests require further experiments.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. Subthermal preparation selects low-energy outcomes from repeated thermalization with an approximately four-kelvin circuit; it does not cool that entire bath to 200 millikelvin or establish the ground state of every motional mode. Spin-identification error estimates depend on thresholds and fitted noise distributions. This paper demonstrated preparation and incoherent spin-transition readout, while stronger magnetic-moment precision, coherent antiproton control and complete matter–antimatter symmetry tests require further experiments.",
    "references": [
      {
        "title": "Orders of Magnitude Improved Cyclotron-Mode Cooling for Non-Destructive Spin Quantum Transition Spectroscopy with Single Trapped Antiprotons (arXiv2404.07928v1)",
        "url": "https://arxiv.org/pdf/2404.07928v1",
        "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained."
      }
    ],
    "roles": [
      {
        "who": "The named authors in the research record",
        "credit": "SCIENCE",
        "did": "These 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."
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  "reader_guide": null,
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}