量子化されたマジョラーナ伝導
Hao Zhang1, Chun-Xiao Liu2, Sasa Gazibegovic3
1QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Nature
|March 29, 2018
まとめ
研究者は2e2/hの量子伝導率高原を観測し,トポロジカル量子コンピューティングのマイオラナゼロモードを確認した. この発見は以前の実験の限界を克服し 将来の編み物実験をサポートします
科学分野:
- 凝縮物質物理学
- 量子コンピューティング
- 材料科学
背景:
- トポロジカル・量子コンピューティングの 準粒子は有望です
- トンネリングスペクトロスコピーは,差電導度におけるゼロバイアスのピークを介して,マジョラーナゼロモードを識別する.
- ゼロバイアスのピークを2e2/hに定量化することは,マジョラーナ対称性によって予測されるが,めったに観測されない.
研究 の 目的:
- 実験的にマイオラナゼロモードの存在を 量子導電性で検証する
- 様々な実験パラメータに対してゼロバイアスのピークの強さを調査する.
主な方法:
- インジウムアンチモナイド半導体ナノワイヤーを使用し,アルミニウム超伝導シェルでコーティングされています.
- ゼロバイアスの伝導性のピークを観察するために電気輸送測定を行う.
- 導電性のピークの高さ,磁場とトンネル結合の安定性,そして温度依存性を分析する.
主要な成果:
- ゼロバイアスの導電性では2e2/hで量子導電性高原が観測された.
- 磁場とトンネル結合の変動にもかかわらずピークの高さは一定でした.
- 量子化されたピークは 電気と磁場と温度変動に対して 頑丈であることが示されました
結論:
- 観測された量子導電性高原は,マイオラナのゼロモードの存在を強く支持する.
- この発見は理論的な予測を検証し,以前の実験的な課題を克服しました.
- この結果は,トポロジカル量子コンピューティングの発展に 基礎を築いた.
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