超伝導回路における光子数値状態の解像度
D I Schuster1, A A Houck, J A Schreier
1Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Nature
|February 3, 2007
まとめ
研究者は,新しい回路量子電動力学 (QED) システムを開発しました. このシステムにより,単一の光子は吸収なしに超伝導量子ビット (量子ビット) に著しく影響し,新しい量子コンピューティングアプリケーションを可能にします.
科学分野:
- 量子コンピューティング
- 量子電動力学 量子電動力学とは
- 超伝導回路について
背景:
- 電磁信号は光子で構成されていますが,それらの離散エネルギーは通常,古典的な回路では明らかではありません.
- サーキット量子電動力学 (QED) は,超伝導クビットとマイクロ波伝送線を統合して単光子効果を観察します.
- 以前の回路QED実験は,共鳴強い結合体制に焦点を当てていた.
研究 の 目的:
- サーキット QED の新しいレジームを探求するために: 強い分散限界.
- 単一の光子が吸収なしに量子ビットに有意な影響を及ぼすことを実証する.
- 量子情報処理のための正確な光子数解像度を可能にするために.
主な方法:
- 超伝導量子ビット (量子ビット) をマイクロ波伝送線に接続する.
- サーキットQEDシステムを強力な分散限界で操作する.
- フォトン数状態に基づいて量子ビットの移行エネルギーを解く.
主要な成果:
- サーキットQEDで強い分散体制を達成しました.
- それぞれの光子数値状態に対して明確なスペクトル線を観測し,高感度を示した.
- 一貫性微波場と熱微波場を区別する能力を実証した.
結論:
- 強い分散力により,繊細な光子の検出と特徴づけが可能です.
- このテクニックは,光子統計分析器を構築するために使用できます.
- 非古典的な光の状態を生成し,量子コンピュータの量子ビット-フォトン条件論理を実行する可能性を可能にします.
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