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LIGOの光とキログラム質量ミラー間の量子相関
Haocun Yu1, L McCuller2, M Tse3
1LIGO, Massachusetts Institute of Technology, Cambridge, MA, USA. haocunyu@mit.edu.
Nature
|July 3, 2020
まとめ
科学者たちは,レーザーインターフェロメーター重力波観測所 (LIGO) の量子相関を用いて,精度測定における標準的な量子限界を克服しました. この突破は重力波検出やその他の量子測定の 感度を高めています
科学分野:
- 量子物理学
- 重力波天文学
- 精度測定
背景:
- ハイゼンベルクの不確実性原理は 精度測定のための標準的な量子限界を設定します
- この限界は,光を探査機として使用する際の光子放射圧と検出の不確実性から生じる.
- この限界を越えるには 測定対象と探査光の間の量子相関が必要です
研究 の 目的:
- レーザーインターフェロメーター重力波観測所 (LIGO) で量子相関の自然発生を実験的に確認する.
- これらの相関が 標準の量子限界を 超えることを証明するために
主な方法:
- 圧縮された真空状態のLIGO検出器のノイズスペクトルの特徴
- 圧縮された真空を 異なる角度で注入する.
- クラシックノイズを引いて 量子力学的不確実性を分離する
主要な成果:
- 量子相関は理論的に予測されたように LIGOで自然に発生しました
- 量子相関による測定では,標準量子限界より1.4倍 (3デシベル) 低い共同量子不確実性を達成した.
- これは,レーザービームの相とミラー位置の不確実性を相関させることで達成されました.
結論:
- この研究は,標準的な量子限界を克服するために量子相関の使用を実験的に検証しています.
- この技術は重力波の観測の感度を増強する.
- この発見は将来の量子ノイズ制限測定に大きく影響する.
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