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Kerr-cat量子ビットの安定化と動作
A Grimm1,2, N E Frattini3, S Puri4
1Department of Applied Physics, Yale University, New Haven, CT, USA. alexander.grimm@psi.ch.
Nature
|August 14, 2020
まとめ
研究者はシュレーディンガー・キャット状態を使って 堅固な量子ビットを作成し,コヒーレンス時間を大幅に改善し,量子コンピューティングと通信のためのより速い操作を可能にしました.
科学分野:
- 量子情報科学
- 超伝導回路
- 量子光学
背景:
- シュレーディンガー猫の状態は 異なる古典的状態の量子スーパーポジションであり,量子計測学,通信,計算において極めて重要です.
- 一貫した状態の重組で量子ビットをエンコードすることは,フェーズフリップエラーに対する保護を提供しますが,実際の実装では,状態の安定化と高速制御で課題に直面します.
研究 の 目的:
- シュレーディンガー・キャット状態を生成し安定させる方法を実験的に実証する.
- これらの状態でコードされたエラー保護クビットの強度と制御を改善します.
主な方法:
- 超伝導マイクロ波共振器で,Kerrの非線形と単調圧縮の相互作用を利用した.
- 非常に興奮したシュレーディンガー・キャット状態の整合性を維持するために,安定化技術を実装した.
主要な成果:
- シングルフォトンフォック状態エンコーディングと比較して,安定した量子ビットの横断リラクゼーション時間を大幅に増加させました.
- 最短のコヒーレンス時間より60倍速く シングルキビットゲート操作を証明した.
- 安定した状態で 保護された量子ビットの 単発読み取りが成功しました
結論:
- 証明された方法は,シュレーディンガーキャット状態を効果的に生成し,安定させ,量子ビットの一貫性を高め,素早い量子制御を可能にします.
- 安定したマクロスコープ状態は 速度とエラーの回復力を組み合わせた 強力な量子情報処理のプラットフォームです
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