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超伝導回路を搭載したToffoliゲートの実装.
1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland. fedoroar@phys.ethz.ch
Nature
|December 16, 2011
まとめ
研究者は,超伝導トランスモン量子ビットを使用して,Toffoliゲートを実装しました. この進歩は,量子エラー補正と普遍的な量子計算に不可欠な複雑な量子操作を簡素化します.
科学分野:
- 量子コンピューティング
- 超伝導クビット
- 量子情報科学とは,量子情報科学である.
背景:
- Toffoliゲートは,普遍的な可逆古典計算と量子エラー修正に不可欠な基本的な3量子ビット操作です.
- 超伝導システムにおけるToffoliゲートの以前の実装では,一貫性時間によって制限された多数の単位および二量子ビットゲートが必要でした.
- 超伝導量子ビットは,マルチキビット操作と量子情報タスクの実装において最近の進歩を示しています.
研究 の 目的:
- マイクロ波共振器と結合された超伝導トランスモンクビットを使用してToffoliゲートを実装する.
- トフフォリゲート実装に必要なエレメンタリーゲートの数を,トランスモン量子ビットの第3エネルギーレベルを利用して減らす.
- 先進的な量子状態とプロセスのトモグラフィー技術を使用して,実装されたToffoliゲートを完全に特徴づける.
主な方法:
- 3つの超伝導トランスモン・クビットとマイクロ波共振器を組み合わせた.
- ゲートの複雑性を減らすために,トランスモン量子ビットの第3エネルギーレベル (トランス2レベルシステム) を利用しました.
- 全プロセストモグラフィーとモンテカルロプロセス認証を採用し,包括的なゲート特徴付けを行いました.
主要な成果:
- 3つの超伝導トランスモン量子ビットを持つToffoliゲートを成功裏に実装しました.
- 実装されたToffoliゲートで68.5 ± 0.5%のフィデリティを達成しました.
- 理論的な提案の2階層システムと比較して,基本的なゲートの数を大幅に削減することが示されました.
結論:
- 超伝導トランスモン量子ビットを用いたToffoliゲートの実装は,複雑な量子操作への実行可能な経路を示しています.
- この研究は,量子コンピューティングとエラー訂正を進めるために,マクロスコープの超伝導クビットの可能性を強調しています.
- 開発された方法は,超伝導量子システムでToffoliクラスのゲートを実現するためのより効率的なアプローチを提供します.
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