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アクティブ・フィード・フォワードを使用して143キロメートル以上の量子テレポーテーション
Xiao-Song Ma1, Thomas Herbst, Thomas Scheidl
1Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria.
Nature
|September 7, 2012
まとめ
研究者は,アクティブ・フィード・フォワードを使用して143kmを超える量子ビットの量子テレポーテーションを達成し,これはグローバルな量子インターネットの重要なステップである. これは,テクノロジーの実用性を示しています.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 量子通信技術について
- 自由空間量子鍵の分布について
背景:
- 量子インターネットは,安全な通信と強化された分散コンピューティングを約束します.
- 量子テレポーテーションは,地球規模の量子ネットワークのために,クビットを長距離に分配するために不可欠です.
- 現実の世界での応用には,かなりの距離のアクティブ・フィード・フォワードによる量子テレポーテーションが必要です.
研究 の 目的:
- 143kmの自由空間光学リンクを介してリアルタイムでアクティブなフィードフォワード量子テレポーテーションを実証する.
- 衛星ベースの量子通信のベンチマークを確立する.
- 量子テレポーテーション技術の成熟性と適用性を実用的なシナリオで検証する.
主な方法:
- カナリア諸島間の2つの自由空間光学リンク (量子と古典) を利用しました.
- 周波数非相関極化絡み合いの光子ペアソースを使用した.
- 集積された超低騒音単光子検出器とエンタグレメント支援のクロック同期.
- アクティブ・フィード・フォワードで量子テレポーテーションを行い,量子プロセスのトモグラフィーで品質が確認されました.
主要な成果:
- アクティブ・フィード・フォワードで143kmを超える独立した量子ビットの量子テレポーテーションを成功裏に達成しました.
- 平均的なテレポーティング状態忠誠度は,古典的な2/3の限界を超えました.
- 完全な量子プロセスのトモグラフィーを用いて,フィードフォワードなしで量子テレポーテーション手順を検証しました.
結論:
- この実験は,アクティブ・フィード・フォワードによる長距離量子テレポーテーションの実現可能性を示しています.
- この成果は,グローバルな量子インターネットと衛星ベースの量子通信を構築するための重要な一歩です.
- 結果は,量子技術の現実世界での展開の準備が整っていることを確認しています.
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