単光子のケル効果による量子状態の崩壊と復活の観測
Gerhard Kirchmair1, Brian Vlastakis, Zaki Leghtas
1Department of Physics, Yale University, New Haven, Connecticut 06511, USA.
Nature
|March 15, 2013
まとめ
研究者らは,強力な単一光子の相互作用のための人工ケール媒体を設計し,一貫した状態の崩壊と復活のような量子効果の観測を可能にしました. この画期的な発見は,量子情報プロトコルと超伝導回路の応用を前進させる.
科学分野:
- 量子光学とは,量子光学である.
- 量子情報科学とは,量子情報科学である.
- 超伝導回路について
背景:
- 量子情報のための非古典的な光の状態を生成するには,強力な単光子相互作用が必要です.
- 穴量子電動力学のような既存の方法は間接的な制御を提供しているが,Kerr媒体は弱い非線形性と損失を誘導する.
- フォトンの相互作用が損失を上回る単一フォトンのケルル体制は,未だに難解である.
研究 の 目的:
- 強力な単光子相互作用を行うことができる人工ケール媒体を設計する.
- このエンジニアリングされた非線形性から生じる新しい量子効果を観察するために.
- 量子情報処理と超伝導回路における応用を探求する.
主な方法:
- 3次元回路量子電動構造を用いた.
- シングルフォトンのKerr体制を達成するために人工的なKerr媒体を設計しました.
- 凝った状態の進化を観察するためにゲダンケン実験を行い,フシミQ関数を測定し,腔状態トモグラフィーを用いた.
主要な成果:
- 損失率を上回る単光子Kerr体制に成功しました.
- フォトンの定量化と非線形相互作用による一貫した状態の崩壊と復活を観察した.
- 生成され,確認された非古典的な多成分"シュレーディンガー猫"状態.
結論:
- 設計されたKerr媒体は,単光子レベルで直接の光子対光子相互作用を可能にします.
- 高品質の光子モードで一貫した状態のスーパーポジションを作成および操作する能力を実証しました.
- 連続変数量子物理学と超伝導回路を組み合わせるための新しい道を開くことで,量子測定,生成,フィードバック,論理における潜在的な応用がある.
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