素早い量子論理ゲートとトラップされたイオン量子ビット

V M Schäfer¹, C J Ballance¹, K Thirumalai¹

¹Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK.

Nature

|March 2, 2018

まとめ

研究者たちは捕まったイオンを使って素早い量子ロジックの新しい方法を開発しましたこの技術は絡み合いの生成を大幅に加速し高精度とエラーに対する頑丈性を達成し先進的な量子コンピュータへの道を切り開きます

科学分野:

量子情報科学
原子物理学
量子コンピュータハードウェア

背景:

閉じ込められた原子イオンは長いコヒーレンス時間と高信頼性の操作により量子コンピューティングの主要なプラットフォームです
閉じ込められたイオンで量子エンタグレメントを生成するための現在の2キビットゲートは,アディアバティック操作要件のために10kHzの速度に制限されています.
より速いゲート操作は量子コンピュータのスケールアップと脱合性を克服するために不可欠です

研究の目的:

捕らわれたイオンシステムで高速で高信頼性の2キビットゲートを実現するための新しい方法を実装します.
従来のアディアバティック限界を大幅に上回る速度で絡み合いの生成を証明する.
実験的なノイズ,特に光学的相変動に対する量子論理操作の堅実性を高める.

主な方法:

特定の軌道に沿って離子運動を正確に制御するために,振幅の形状のレーザーパルスを使用します.
誘導レーザーパルスの光学相に対して無感性を備えたゲート操作.
単一の振幅形パルスとゲート実行のための連続波レーザービームのペアを実装した.

主要な成果:

メガヘルツ速度の量子ロジックを実現し 480ナノ秒で絡み合いの生成を可能にしました
標準的な方法より10倍以上の誤差率で 99.8%の精度で 1.6ミクロ秒のゲートを示した.
この方法は,高精度を維持しながら,レーザーの強度を増したより速いゲートの可能性を示しています.

結論:

開発された技術は,トラップされたイオン量子ビットのサブマイクロ秒量子論理速度への経路を提供します.
このアプローチは,閉じ込められたイオン (一貫性,忠誠度) の強みを,固体系で通常見られる速度と組み合わせている.
この方法は,スケーラブルで故障を許容する量子コンピュータの開発を加速させることを約束しています.

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