超伝導相量子ビットを使用して3量子ビット絡み合いの状態を生成する.
Matthew Neeley1, Radoslaw C Bialczak, M Lenander
1Department of Physics, University of California, Santa Barbara, California 93106, USA.
Nature
|October 1, 2010
まとめ
研究者は,超伝導量子ビットを使用して,GHZとWの3量子ビット絡み合いの状態を作成し,測定することを実証しました. これは,2つの量子ビットを超えた複雑な量子絡み合いを実験的に実現することによって,量子計算を前進させます.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 超伝導量子コンピューティング
背景:
- 絡み合いは,量子計算のための重要なリソースです.
- 超伝導装置は,アルゴリズムとベルの不等式テストの2量子ビット絡み合いを実証しています.
- 3つの量子ビットは,2つの量子ビットの単一のタイプとは異なり,2つの異なる絡み合いタイプを示します.
研究 の 目的:
- 超伝導量子ビットを使用して,実験的に3量子ビットの絡み合った状態 (GHZとW) を生成し,測定する.
- これらの状態を特徴づけ,真の3量子ビット絡み合いを確認する.
主な方法:
- 3つのカップリングされた超伝導相量子ビットを使用しました.
- 完全な状態の特徴化のために量子状態トモグラフィーを採用した.
- 絡み合いの目撃者を用いて,絡み合いを確認した.
主要な成果:
- GHZとWの両方の3量子ビットの絡み合った状態を成功裏に作成し,測定しました.
- 量子状態トモグラフィーは,生成された状態の忠実さを確認しました.
- 絡み合いの目撃者は,状態が2量子ビットの絡み合いの混合物に分離できないことを実証しました.
結論:
- この研究は,異なる3量子ビット絡み合いの状態の創造のための実験的証拠を提供します.
- この結果は,量子コンピュータの物理的な実装を進めるために重要なものです.
- 複雑な量子情報処理のための超伝導量子ビットの有用性を確認しました.
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