閉じ込められたイオンメカニカルオシレータで量子ビットをエンコードする
C Flühmann1, T L Nguyen2, M Marinelli2
1Institute for Quantum Electronics, ETH Zürich, Zürich, Switzerland. christaf@phys.ethz.ch.
Nature
|March 1, 2019
まとめ
研究者らは単一の捕獲イオンを使用して新しい量子エラー修正方法を実証しています. このアプローチは量子情報を ハーモニック・オシレータにコードし 論理的状態とゲートの高精度を達成し 先進的な量子コンピューティングとセンシングの道を開きます
科学分野:
- 量子情報科学
- 量子コンピューティング
- 量子センシング
背景:
- 安定した量子コンピュータの動作には 堅固な量子エラーの修正が必要です
- 量子エラーの修正は しばしば複数の物理量子ビットや ハーモニック・オシレータのような 高次元システムに依存します
- 量子ビットをハーモニック・オシレータでエンコードする前の提案は 実験的に難しいものでした
研究 の 目的:
- ハーモニック・オシレータの 強力な量子エラー・エンコーディング・スキームを 実験的に実証する
- シングル・トラップ・イオン・システムを使って 暗号化された量子ビットを実現し制御する.
- 量子エラー修正と量子センシングの応用を探求する.
主な方法:
- ハーモニックオシレータとして1つのトラップされたCa+イオンを使用した.
- キュービット・エンコーディングに 移動した圧縮状態の重置を使用した.
- 機械的な振動器を制御し 補助的な内部状態の量子ビットと結合して測定した
主要な成果:
- 87.3 ± 0.7%の平均正方形の精度で論理状態を準備し,再構築しました.
- 高プロセスの忠誠度 (約) を有するユニバーサルロジカルシングルキビットゲートセットを実証した. パウリゲートでは97%,連続回転では89%).
- 離散型および連続型変数操作の両方に高精度を達成しました.
結論:
- 証明された制御方法は,連続変数量子誤差補正のための実行可能な経路を提供します.
- この技術は,離散変数と連続変数を組み合わせた 混合量子情報スキームを可能にします.
- 暗号化された状態は,位置とモメントの測定を同時に行うための量子センシングに直接適用されます.
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