ボゾン量子ビットを自律量子エラー修正で保護する
Jeffrey M Gertler1, Brian Baker2, Juliang Li1
1Department of Physics, University of Massachusetts Amherst, Amherst, MA, USA.
Nature
|February 11, 2021
まとめ
研究者は,カスタマイズされた分散を用いた新しい受動的量子エラー修正 (QEC) 方法を実証した. このアプローチは,超伝導量子ビットのエラーを自動で修正し,コヒーレンス時間を向上させ,量子コンピューティングのためのリソース効率の良い経路を提供します.
科学分野:
- 量子コンピューティング
- 量子情報科学
- 量子エラーの修正
背景:
- 普遍的な量子コンピュータを構築するには,効果的な量子エラー修正 (QEC) が必要です.
- 現在のQEC方法は,アクティブエラーシンドロームの測定と,ハードウェアが集約され,エラーを導入できるアダプティブ操作に依存しています.
- オーダーメイドの分散によって自律的なQECを達成することは大きな課題でした.
研究 の 目的:
- エンジニアリングによる分散を用いた 量子エラー修正プロトコルの実証です
- エラーシンドロームのオペレータを 安定させるため 特に光子数対数で 超伝導体腔に
- 量子情報を保護し ボゾン量子ビットのコヒーレンス時間を強化する
主な方法:
- 超伝導体内のシュレディンガーの猫のようなマルチフォトン状態で論理量子ビットをコードする.
- 連続波制御フィールドを使用して補正分散プロセスを実装します.
- 高精度読み取りや高速デジタルフィードバックなしで,受動的なエラー修正を使用します.
主要な成果:
- 単一フォトンの損失を自律的に修正する受動的プロトコルを示した.
- ボゾン量子ビットのコヒーレンス時間を 2倍に増やした
- QECは従来の洗練された要求と対照的に,控えめなハードウェアセットアップで達成されました.
結論:
- エンジニアリングによる量子分散は,アクティブQECに資源効率的な代替手段または補足を提供します.
- この受動的アプローチは,将来の量子コンピューティングアーキテクチャの他の故障耐性技術と互換性があります.
- 証明された方法は,QECを実装するためのハードウェア要件を簡素化します.
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