一貫性フォトン変換を用いた効率的な量子コンピューティング
N K Langford1, S Ramelow, R Prevedel
1Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria. nathan.langford@univie.ac.at
Nature
|October 14, 2011
まとめ
量子状態の生成と処理のための決定論的方法であるコヒーレントフォトン変換 (CPC) を導入します. この進歩は,光子量子情報アプリケーションのための汎用的なツールキットを提供し,単光子の生成と操作における現在の非効率性を克服します.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 量子光学とは,量子光学である.
- 非線形光学は,非線形光学である.
背景:
- 単一の光子は,量子情報の主要な媒介体であり,絡み合いの実証を可能にします.
- 単一の光子を準備し,処理し,測定するための現在の方法は,非効率で確率的です.
- ダウン変換のような既存の技術は,ランダムにタイミングされた光子を生成し,線形光学のゲートは本質的に確率的である.
研究 の 目的:
- フォトニック量子情報のための複雑で多量子的状態の生成と処理のための決定的プロセスを導入する.
- 現在の制約を克服するための汎用的なソリューションとして,コヒーレントフォトン変換 (CPC) を提示します.
- スケール可能な量子コンピューティングのためのディヴィンチェンゾの基準を満たす完全なフォトニック量子処理ツールを提供します.
主な方法:
- 古典的にポンプされた非線形性を利用して,複数の量子刺激の直角的状態間の一貫した振動を誘導します.
- CPCの具体的な例として,ポンプによる4波混合相互作用を使用します.
- 光子結晶繊維を用いた四色非線形プロセスから量子相関を実験的に実証する.
主要な成果:
- CPCは,フォトニック量子処理ツールの完全なスイートに,単一の,汎用的なプロセスを提供します.
- 決定的マルチクビットエンタグレメントゲートを達成し,高品質の単光子およびマルチ光子状態を予告しました.
- 頑丈で高効率の検出と,下向き変換を向上させ,上位レベルの影響を軽減する可能性があることが実証されています.
結論:
- コヘレントフォトン変換 (CPC) は,フォトニック量子情報アプリケーションを進めるための決定的経路を提供します.
- 開発されたツールは,DiVincenzoの基準を満たし,スケーラブルな量子コンピューティングアーキテクチャの道を開く.
- このスキームは,他の物理システムに適応可能であり,多国間調停のための高級非線形を使用して拡張できます.
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