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単原子量子ビットの絡み合いは,距離にある
D L Moehring1, P Maunz, S Olmschenk
1FOCUS Center and Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA. david.moehring@mpq.mpg.de
Nature
|September 7, 2007
まとめ
研究者らは,光子を使って,1メートル離れた2つの単原子量子記憶を絡ませた. この画期的な進歩は,スケーラブルな量子情報処理と量子コンピューティングのアプリケーションを進歩させています.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 原子物理 原子物理学
- 量子光学とは,量子光学である.
背景:
- 量子情報科学は,スーパーポジションやエンタグメントのような量子現象を活用して,より高度な計算を可能にします.
- 安定した量子記憶 (量子ビット) と効率的な情報転送は,大規模量子プロセッサにとって極めて重要です.
- フォトンは,量子情報を距離にわたって分散させるのに理想的であり,原子は優れた量子記憶として機能します.
研究 の 目的:
- 顕微鏡の距離で隔てられている2つの固定された単原子量子記憶の間の絡み合いを示すために.
- 遠隔の個々の原子量子ビット間の絡み合いを作る方法を確立する.
- 拡張可能な量子情報アプリケーションにおけるこの方法の可行性を評価する.
主な方法:
- 閉じ込められた原子イオンを単原子量子記憶として利用した.
- 遠く離れた2つの原子イオンから放出された単一の光子.
- 原子量子ビット間の絡み合いをシグナルするために放出された光子を干渉し,検出しました.
- 高い検出効率で量子ビット相関を測定することによって,絡み合ったペアを特徴付けました.
主要な成果:
- 1メートル離れた2つの単原子量子記憶の絡み合いを成功裏に実証しました.
- 絡み合った量子ビット相関の特徴づけにおいて,ほぼ完璧な検出効率を達成した.
- 原子量子ビットの絡み合いの信頼できる指標として,光子の干渉と検出を確認しました.
結論:
- 実証された方法は,遠隔の固定単原子量子ビットを絡めるための実行可能な経路を提供します.
- この確率的絡み込み技術は,スケーラブルな量子情報処理アーキテクチャに統合するのに適しています.
- この研究は,分散型量子コンピュータとネットワークの構築に向けた重要な一歩を表しています.
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