ほぼ量子限定のジョセフソン移動波パラメトリック増幅器
C Macklin1, K O'Brien2, D Hover3
1Quantum Nanoelectronics Laboratory, University of California, Berkeley, Berkeley, CA 94720, USA. Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. chris.macklin@berkeley.edu.
Science (New York, N.Y.)
|September 5, 2015
まとめ
微弱なマイクロ波信号を検知する 超伝導アンプを開発しました この移動波装置は 量子情報処理と計測学にとって 重要な高強度と幅広い帯域を 提供します
科学分野:
- 量子光学
- 超伝導装置
- マイクロウェーブ工学
背景:
- 単光子レベルのマイクロ波信号を検出することは 量子情報科学にとって重要ですが 技術的に難しいものです
- 既存の超伝導増幅器は 複数の量子ビットの読み取りのような高度なアプリケーションに 必要な増幅,帯域幅,またはダイナミックレンジが不足しています
研究 の 目的:
- 低エネルギーマイクロ波信号の検出を強化するための新しい超伝導増幅器のアーキテクチャを導入する.
- 超伝導量子ビットの読み取りに 十分なダイナミックレンジを
主な方法:
- ジョセフソン・ジャンクション・トランスミッションラインを利用した移動波超伝導増幅器の開発.
- 独特の非線形マイクロ波装置の分散関係を設計するためのサブ波長共振相対応技術の実装.
- 弱度の測定で増幅器の性能をベンチマークする.
主要な成果:
- ジョセフソン増幅器は 多ギガヘルツの帯域幅で 高い強度を示しています
- この装置は20個の超伝導量子ビットの読み取りを容易にするのに十分なダイナミックレンジを備えています.
- 75%の高い量子効率 (後の増幅器のノイズを含む70%) が達成されました.
結論:
- 開発された移動波のジョセフソン増幅器は,既存の技術よりも重要な進歩を提供します.
- 柔軟な設計と高い性能により,マイクロ波計測と量子光学に広く適用できます.
- この技術は量子コンピューティングと 敏感な信号検出の進歩に 役立つでしょう
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