絡み合った光学原子時計の基本的な量子ネットワーク
B C Nichol1, R Srinivas2, D P Nadlinger3
1Department of Physics, Clarendon Laboratory, University of Oxford, Oxford, UK. bethan.nichol@physics.ox.ac.uk.
Nature
|September 7, 2022
まとめ
研究者は2メートル離れた2つのストロンチウムイオンクロックをつなぐ フォトニックリンクを使って 絡み合った光学クロックの 量子ネットワークを作りました この絡み合いは測定の不確実性を大幅に減らし,時間と頻度の比較を強化するためにハイゼンベルグ限界に近づいた.
科学分野:
- 量子情報科学
- 原子物理学
- メトロロジー
背景:
- 光学的な原子時計は,最も正確な時間と周波数測定ツールです.
- 遠隔光学時計を比較することで,基本的な物理テスト,地位測量,時計の誤差評価が可能になります.
- 混じり合いは標準的な量子限界を超え ハイゼンベルクの限界に達し 精度が向上します
研究 の 目的:
- リモートイオンを使って 絡み合った光学時計の 量子ネットワークを証明する
- 遠隔の原子系間の高信頼性の絡み合いのための光子リンクの使用を調査する.
- 周波数比較で絡み合うことで得られる精度向上を定量化する.
主な方法:
- 約2メートル離れた2つの88Sr+イオンを 絡めるために光子リンクを使用した.
- 絡み合ったイオン間の精度の比較を行った.
- 従来のスペクトロスコーピーの技術と比較して不確実性の低下を測定した.
主要な成果:
- 遠隔の88Sr+イオンが 互いに絡み合って 基本的な光学時計の 量子ネットワークを形成しています
- 周波数比較のハイゼンベルグ限界に近づく測定不確実性の減少を達成しました.
- 従来の方法と比較して,レーザー解相により測定不確実性が2倍減少した.
結論:
- フォトニックリンクによるエンタグリングにより,遠隔光学クロック比較の精度が向上します.
- この2つのノードネットワークは,高度な計測学と物理学のためのより大きな量子ネットワークへの基礎的なステップを表しています.
- 証明された技術は,現在の光学時計の比較の限界を克服するための経路を提供します.
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