ゲルマニウムに穴がある高速の2キビット論理
N W Hendrickx1,2, D P Franke1,2, A Sammak1,3
1QuTech, Delft University of Technology, Delft, The Netherlands.
Nature
|January 15, 2020
まとめ
研究者は ゲルマニウムホールの量子ドットを使って 普遍的な量子ロジックを実証しています この突破により 素早く高精度な シングル・アンド・ツー・キュービット・ゲートが可能になり 量子コンピューティング・プラットフォームを 進歩させました
科学分野:
- 量子情報科学
- 固体物理学
- 材料科学
背景:
- ユニバーサル量子情報処理は シングルと2量子ビットの論理ゲートに依存しています
- 量子ドットのスピン量子ビットは GaAsとシリコンで示された制御で量子計算に有望です
- これらのシステムでは,ローカル制御による普遍的な量子ロジックはまだ達成されていません.
研究 の 目的:
- ゲルマニウムの穴の量子ドットを使って 普遍的な量子論理を証明する
- ジェルマニウムの特性を活用して 高精度で高速な量子ビットの操作をする
- 量子情報アプリケーションの 実行可能なプラットフォームとして ゲルマニウムを確立する
主な方法:
- トンネルカップリングとデチューニングの精密な制御のために,低混乱の量子井戸を使用しました.
- 充電対称性ポイントで動作する量子ビットで 性能を向上させる
- 100MHzを超える周波数でのクイビット制御のためのスピン軌道カップリングを利用した.
主要な成果:
- 99.3%の精度と20nsのゲートタイムでシングルキビットゲートを達成しました.
- 75秒以内に2キビット論理操作を証明した.
- スピン・オービト・カップリングによって 急速な量子ビットの制御が確立された.
結論:
- ゲルマニウムホールの量子ドットは 高速で高信頼性の 普遍的な量子論理を可能にします
- 量子情報処理の主要な材料として, 制御と速度位置を示した.
- この研究はスケーラブルな量子コンピュータの開発に 大きく貢献します
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