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単一のホールの光学ポンプは,量子ドットの中でスピンします
Brian D Gerardot1, Daniel Brunner, Paul A Dalgarno
1School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK. b.d.gerardot@hw.ac.uk
Nature
|January 25, 2008
まとめ
研究者は,量子ビットのための半導体ホールを用いて,核相互作用によって引き起こされる電子スピンデコエレンスを克服することを調査しました. この研究は,高精度ホールスピン初期化を実証し,堅牢な固体量子ネットワークの道を開く.
科学分野:
- 量子情報科学とは,量子情報科学である.
- 固体物理 固体物理学
- マテリアルサイエンス 材料科学
背景:
- 量子ドットにおける電子のスピンは有望な量子ビットですが,核の超微細な相互作用によって脱合性を引き起こします.
- Spin-echoのような既存の方法は,この相互作用を完全にキャンセルするには不十分です.
- ゼロスピン原子核を持つ代替材料は実現するのが困難です.
研究 の 目的:
- 堅固な量子ビットの電子の代替として半導体穴を調査する.
- 量子ドットにおけるホールスピンの高精度初期化方法を実証する.
- 固体量子ネットワークにおけるホールスピンの可行性を評価する.
主な方法:
- 核の超精細相互作用を抑制するために,バレンスの穴のユニークなp軌道特性を利用する.
- 自己組み立て量子ドットにおけるシングルホールのスピンの初期化のために光学ポンプを使用します.
- 穴のスピンフィデリティとリラクゼーション時間をゼロと低い磁場で測定する.
主要な成果:
- ハイフィデリティを達成した (約. 99%) 単一ホールスピンの初期化.
- 磁場ゼロでも,軽微な穴スピンの超微細な相互作用が実証された.
- 長い穴のスピンリラクゼーション時間 (約. 1ミリ秒) の低フィールドで.
結論:
- 半導体ホールは,抑制されたデコヘレンスを有する堅固な固体量子ビットの有望な道を提供します.
- 光学ポンプは,量子情報処理に不可欠な高精度ホールのスピン初期化を可能にします.
- この研究は,スピンとフォトンの極化を相互変換できる量子ネットワークへの道筋を提供します.
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