電子の量子トモグラフィー
T Jullien1, P Roulleau1, B Roche1
1Service de Physique de l'Etat Condensé, IRAMIS/DSM (CNRS URA 2464), CEA Saclay, F-91191 Gif-sur-Yvette, France.
Nature
|October 31, 2014
まとめ
研究者は,単一の電子のための量子トモグラフィーを実証し,波動関数の再構築を可能にします. この電子量子光学の突破は,フェルミオンによる量子情報処理の新たな道を開く.
科学分野:
- 量子物理学とは,量子物理学のことです.
- 凝縮物質物理学 凝縮物質物理学
- 量子光学とは,量子光学である.
背景:
- 量子状態の知識は,測定結果の予測に不可欠です.
- 標準的なトモグラフィーの方法は,光子には効くが,振幅の制限のため,電子のようなフェルミオンには効かない.
- 以前の提案では,電子の波動関数の決定のために,量子導体内の電流測定を使用することを提案しました.
研究 の 目的:
- 単一の電子のための量子トモグラフィの実現可能性を実証するために.
- 弾道導体内の単一の電子のウィーガー分布関数を再構築する.
- フェルミオンによる量子情報のためのプラットフォームとして弾道導体における電子量子光学を確立する.
主な方法:
- 電圧パルスを使用して,電子をよく制御された量子状態 (レビトン) に準備する.
- 電子穴対から生成された弱振幅のフェルミオン場とレビトンを混合する.
- エネルギー密度行列の要素を得るため,電子束分割器で騒音の変動を測定する.
主要な成果:
- 単一の電子のウィニガー分布関数を成功裏に再構築した.
- 量子トモグラフィーが,高いノイズ感度にもかかわらず達成可能であることを実証した.
- フェルミオン量子情報のための電子量子光学の可能性を示した.
結論:
- この研究は,電子量子トモグラフィーの実用的な方法を確立しています.
- それは電子量子光学と量子情報におけるその応用の分野を前進させる.
- この技術は,電子の絡み合い,脱合性,相互作用を研究するために拡張され,冷たいフェルミオン原子に適用することができます.
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