ジョセフソン交差点における消散誘発の非相関性の時間解像度測定

S Han¹, Y Yu, X Chu

¹Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA. han@ku.edu

Science (New York, N.Y.)

|August 25, 2001

まとめ

研究者は,ジョセフソン交差点における分散誘発脱合時間 (DIDT) を測定した. この発見は,量子コンピューティングの進歩と量子ダイナミクスの理解にとって極めて重要です.

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
量子コンピューティング

背景:

超伝導回路は,量子コンピューティングにとって有望である.
デコヘレンスは,量子システムの性能を制限する.
ジョセフソン・ジャンクションは,超伝導量子ビットの重要な構成要素です.

研究の目的:

超伝導ジョセフソントンネル交差点の分散誘発脱合時間 (DIDT) を決定する.
交差点の脱出ダイナミクスにおけるエネルギーリラクゼーションの役割を調査する.
量子コンピューティングのためのジョセフソンデバイスの可能性を評価する.

主な方法:

脱出ダイナミクスの時間解像度測定.
時間に依存した脱出確率の分析.
2段階の崩壊トンネリングプロセスの特徴.

主要な成果:

脱出確率の2倍指数関数的な行動が観察され,これは2段階の崩壊トンネリングプロセスを示しています.
DIDTを直接測定し,0.55Kでtau (d) >11マイクロ秒であることが判明しました.
エネルギーのリラックスがシステムダイナミクスに大きく影響することを示した.

結論:

測定されたDIDTは,実用的な量子コンピューティングアプリケーションのために十分な長さです.
ジョセフソン・ジャンクションは,マクロスコープの量子相関性を実現するために好ましい性質を示しています.
この研究は,超伝導量子システムにおける脱相関メカニズムに関する重要な洞察を提供します.

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