超伝導量子回路における反復エラー検出による状態保存
J Kelly1, R Barends1, A G Fowler2
1Department of Physics, University of California, Santa Barbara, California 93106, USA.
Nature
|March 6, 2015
まとめ
研究者は,量子エラー補正 (QEC) を使用して,量子ビット数を増加させることで,環境エラーから古典的な状態を保護しました. これは,堅牢な量子コンピュータを構築するために不可欠なエラー抑制のスケーラブルなアプローチを示しています.
科学分野:
- 量子コンピューティング
- 量子エラー補正 量子エラー補正
背景:
- 量子コンピューティングの実行可能性は,環境エラーから量子状態を保護することに依存しています.
- 量子エラー補正 (QEC) は,量子ビットのエラーを特定し,修正するために不可欠です.
- 量子システムのスケーリングには,論理的な失敗を防ぐために,強力なエラー抑制が必要です.
研究 の 目的:
- 環境のビットフリップエラーからの古典的な状態の保護を証明するために.
- QECを使用してシステムのサイズを増やすことでこれらのエラーの抑制を示します.
- 非古典的な状態の保存を確認する.
主な方法:
- 2Dの表面コードQECへのステップとして,9つの量子ビットの線形配列を使用しました.
- 誤差を追跡するために,投影的量子非破壊対数測定を使用した.
- グリーンベルガー-ホーン-ゼイリンガー保存状態のトモグラフィの検証を行いました.
主要な成果:
- 5つのクビットを使用して入力状態を2.7の因数で回収する際の失敗率を削減しました.
- 失敗率を8回サイクルで9つの量子ビットを使用して8.5倍削減しました.
- 非古典的な状態の保存を成功裏に検証しました.
結論:
- システムのサイズを増やすことで環境によって引き起こされるエラーを効果的に抑制することが実証されています.
- この研究は,大規模な超伝導量子コンピュータを構築するための基礎を提供します.
- 量子コンピューティングにおける実験的な課題を克服する上でQECの重要性を強調する.
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