超伝導原子コンタクトにおけるアンドリーフ状態の一貫した操作

C Janvier¹, L Tosi², L Bretheau¹

¹Quantronics Group, Service de Physique de l'État Condensé, CNRS UMR 3680, IRAMIS, CEA-Saclay, 91191 Gif-sur-Yvette, France.

Science (New York, N.Y.)

|September 12, 2015

まとめ

研究者は,超伝導的な弱いリンクでアンドリーフ結合状態を使用して,新しい量子システムの一貫した制御を実証しました. この発見は量子情報と超伝導物理学の基礎研究に新たな可能性をもたらします

科学分野:

量子コンピューティング
凝縮物質物理学
超伝導性

背景:

量子状態の一貫した制御は,通常,超伝導装置の集合的電磁気自由度を使用して達成されます.
超伝導的な弱いリンクにおけるアンドリーフ結合状態のような顕微鏡準粒子状態は,量子操作のために広範に調査されていません.

研究の目的:

アンドリエフ・バインド状態に基づく量子システムのコヒーレント操作を証明する
アンドリーフ量子ビットの潜在力を量子情報応用と基礎物理研究に活用する.

主な方法:

量子操作のための回路量子力学 (cQED) のセットアップを使用した.
アンドリーフ・キュービットのシングルショット読み取りを行いました
量子現象を観察するために継続的な測定を行いました

主要な成果:

アンドリーフ量子ビットの協調的な操作を達成した
マイクロ秒の範囲で,興奮状態の寿命とコヒーレンス時間を決定します.
連続測定で観測された量子ジャンプとパリティスイッチング

結論:

顕微鏡のアンドリーフ結合状態に基づいたアンドリーフ量子ビットは一貫した量子制御のための実行可能なプラットフォームです
これらの量子ビットは量子情報処理に適した有望なコヒーレンス時間と観測可能な量子現象を示しています
アンドリエフ量子子は,超伝導体における単一の基本的な興奮の物理学を調査するための貴重なテストベッドとして機能します.

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