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ACジョセフソン・ジャンクションレーザーのデモ
M C Cassidy1, A Bruno1, S Rubbert2
1QuTech, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, Netherlands.
Science (New York, N.Y.)
|March 4, 2017
まとめ
研究者はACジョセフソン効果を用いた超伝導レーザーを実証した. この装置は量子コンピューティングの 応用のためにコヒーレントなマイクロ波フォトンを オンチップで効率的に生成します
科学分野:
- 超伝導電子
- 量子光学
- 固体物理学
背景:
- 超伝導装置は高速で エネルギー損失が少ないので コンピューティングに好都合です
- 超伝導技術の進歩には,レーシングのような一貫性の実証が不可欠です.
- ACジョセフソン効果は,光子生成の可能性のある超伝導体の基本的な性質です.
研究 の 目的:
- ACジョセフソン効果を利用した 超伝導レーザーのデモです
- 低温でコヒーレントなマイクロ波フォトンの効率的なオンチップ生成を実現する.
- 量子装置とジョセフソン・ジャンクションベースのレーザーの統合を調査する.
主な方法:
- 超伝導体と結合したジョセフソン・ジャンクションを 作った
- ジョセフソン交差点に DC電圧のバイアスを適用して マイクロ波フォトンを生成した
- ジョセフソン周波数を基本モードにダウン変換するために,回路の非線形性を利用した.
主要な成果:
- ジョセフソン・ジャンクションと 超伝導体を使って レーザーを成功裏に実証した
- 高度なジョセフソン周波数を 洞穴の基本モードに効率的に変換した
- チップ上でコヘラントマイクロ波フォトンの生成の可能性を示した.
結論:
- ACジョセフソン効果に基づく超伝導レーザーは実現可能である.
- この技術により 効率的な低温マイクロ波光子の生成が 量子応用で可能になります
- シンプルな設計により,他の量子電子装置との統合が容易になります.
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