ジョセフソン相量子ビットにおけるベル不等式の違反
Markus Ansmann1, H Wang, Radoslaw C Bialczak
1Department of Physics, University of California, Santa Barbara, California 93106, USA.
Nature
|September 26, 2009
まとめ
研究者はジョセフソン相量子ビットを用いてベル不等式を破り,固体系における量子力学を確認した. この実験は,マクロスコープの電気回路が量子システムのように振る舞うという強力な証拠を提供します.
科学分野:
- 量子力学は,量子力学という
- 固体物理 固体物理学
- 量子情報科学とは,量子情報科学である.
背景:
- 量子力学の測定は予測不可能であり,隠された古典的過程の理論につながる.
- ベル不等式は相関を定量化し,古典的行為と量子的行動を区別する.
- 以前の実験は量子力学の証拠を提供しましたが,抜け穴は残っていました.
研究 の 目的:
- 固体状態システムにおけるベル不等式の違反を証明する.
- マクロスコープの電気回路の量子性質の実験的証拠を提供すること.
- ベル不等式テストの検出の抜け穴を埋めるために.
主な方法:
- 絡み合ったスピン1/2粒子として,ジョセフソン・フェーズ・キュービット一対を活用した.
- ベル不等式のクラウザー・ホーン・シモニー・ホルト (Clauser-Horne-Shimony-Holt, CHSH) バージョンを使用した.
- 決定的に絡み合った状態を生成し,両方の量子ビットでシングルショット測定を行った.
主要な成果:
- CHSHベル不平等の違反を示した.
- ベル信号を2.073 ± 0.0003で測定し,2.の古典的限界を大幅に上回りました.
- 結果は244標準偏差で古典的境界を超え,検出の抜け穴を埋めました.
結論:
- この実験は,マクロスコープの電気回路が量子力学に従っているという強力な証拠を提供します.
- 固体系で観察された相関の非古典的性質を確認した.
- 物理的現実の記述としての量子力学の完全性を強化する.
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