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Updated: Sep 10, 2025
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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1.7×10^{-20} ブラックボディ放射 ストークの不確実性を持つ冷凍光学格子時計
Youssef S Hassan1,2, Kyle Beloy1, Jacob L Siegel1,2
1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Physical review letters
|August 27, 2025
まとめ
この研究では,新種の放射線シールドを搭載した冷凍光学格子時計 (OLC) が提示され,原子時計の性能と精度を向上させるためにブラックボディ放射線 (BBR) の影響を大幅に軽減します.
科学分野:
- 原子,分子,光学物理学
- メトロロジーと測定科学
- 量子情報科学
背景:
- 周囲の熱放射線からのスターク波乱を制御することは,原子周波数標準,特に光学格子時計 (OLC) の進歩に不可欠です.
- 以前の冷凍ブラックボディ放射線 (BBR) 制御ソリューションは,OLCでシールド効果の制限に直面しました.
研究 の 目的:
- ダイナミックに動作する 放射線シールドを搭載した 冷凍OLCを テストする
- イテルビウム (Yb) のBBRスターク動的補正係数を独立に測定し,検証する.
主な方法:
- ダイナミックに動作する放射線シールドを備えた冷凍OLCの開発と実装.
- 理想に近い冷凍BBR環境を作り出すためにシールドを使用し,スペクトロスコピーの間に百万分のレベルでの外部の熱放射線を拒絶します.
- 広範囲の温度でシールドの放射線制御を利用して係数を測定する.
主要な成果:
- 以前の最先端のOLCよりも約40倍良い,分数の周波数でスターク波乱制御を達成しました.
- YbのBBRスタークダイナミック修正係数の不確実性を30%減らしました.
- Ybの静的BBR係数を 10−18 レベルで確認した.
結論:
- ダイナミックな放射線シールドで実証された冷凍OLCは,原子周波数規格のためのBBR制御を大幅に進める.
- Yb BBR Starkのダイナミック修正係数の独立した測定は,室温で動作するものを含め,現在および将来のYb OLCに利益をもたらします.
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