フラックス誘導型トポロジカル超伝導性
S Vaitiekėnas1, G W Winkler2, B van Heck2
1Center for Quantum Devices and Microsoft Quantum Lab-Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
Science (New York, N.Y.)
|March 29, 2020
まとめ
研究者らは,ハイブリッドナノワイヤでトポロジカル超伝導性 (TSC) を達成するための新しい方法を実証した. 超伝導シェルに磁気流を適用すると,量子コンピューティングのアプリケーションに不可欠なマイオラナゼロモードが誘発されます.
科学分野:
- 凝縮物質物理学
- 材料科学
- 量子コンピューティング
背景:
- ハイブリッド半導体-超伝導体ナノワイヤは,トポロジカル超伝導性を探求するための重要なプラットフォームです.
- トポロジック超伝導 (TSC) は,強固な量子情報処理を実現するために非常に重要です.
研究 の 目的:
- ハイブリッドナノワイヤでトポロジカル超伝導性 (TSC) を誘導するための新しい経路を提示する.
- TSCの達成における磁気流と超伝導相巻きの役割を調査する.
- マジョラナゼロモードの存在を確認する
主な方法:
- ハイブリッド半導体-超導体ナノワイヤの製造,完全な超導体シェル.
- ナノワイヤのコアを通る制御された磁気流の適用
- トンネリングスペクトロスコーピーは 誘発されたエネルギーギャップを検知します
- コロンブブロックのピーク間隔の分析
主要な成果:
- 磁気流がゼロに近い状態で 固い誘導の隙間が観測され ゼロフェーズ・ウィンドリングを示した.
- 1つのフルス量子の周りに分離されたゼロエネルギー状態のギャップ領域が現れ,2π相の巻き上げを示した.
- 理論的な分析は,超伝導的フェーズ巻きがトポロジカルなフェーズトランジションを誘導することを確認した.
- コロンブブロックのピーク間隔を測定すると,マジョラーナモードと一致する長さの依存性が示された.
結論:
- この研究では,磁気流を利用したハイブリッドナノワイヤのトポロジカル超伝導性を達成する方法を成功裏に実証しました.
- この発見は,ナノワイヤの端にMajoranaのゼロモードが存在するという強力な証拠を提供します.
- この研究は,トポロジカル量子コンピューティングのためのプラットフォームの開発を進めています.
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