相互作用するマイクロ波フォトンの堅固な結合状態の形成

A Morvan¹, T I Andersen¹, X Mi¹

¹Google Research, Mountain View, CA, USA.

Nature

|December 8, 2022

まとめ

研究者は量子回路で相互作用する光子の安定した多粒子結合状態を証明しましたこの発見は,統合できないシステムにおける結合状態の安定性に関する既存の理論に異議を唱えている.

科学分野:

量子物理学
凝縮物質物理学
量子情報科学

背景:

複雑な相互依存により,相関した粒子システムは重要な計算上の課題を提示します.
強く相関するシステムの理解は,粒子の数や相互作用の強度が増加するにつれて減少します.
多粒子結合状態は相互作用するシステムの重要な特徴です.

研究の目的:

Spin-1⁄2 XXZモデルの量子シミュレーションで多粒子結合状態を実験的に調査する.
統合性を破る条件下で結合状態の安定性を調べる
数体スペクトルと結合状態の性質を特徴付けるための新しい方法を開発する.

主な方法:

超伝導量子ビットの高精度パラメータ化可能なfSimゲートの開発と実装.
周期量子回路の構築,スピン1/2 XXZモデルを24量子ビットでシミュレートする.
少量体スペクトルと擬電荷を分析するために,相感知法と合成フクロスを利用する.
結合性を破壊し,結合状態の回復力を観察する相互作用を導入する.

主要な成果:

量子回路で伝播する結合状態の観測,最大5つの光子まで持続する.
数体スペクトルの成功構造と結合状態の擬電荷の抽出
連続体スペクトルと重なり合う場合でも,結合状態が整合性を破る予期せぬ回復力.
相互作用する光子の結合状態の存在と安定性に関する実験的証拠

結論:

この研究は,相互作用する光子の結合状態の最初の実験的証拠を提供します.
この量子シミュレーションの束縛状態は統合限界を超えて驚くべき安定性を表しています
これらの発見は,統合不可能な量子システムにおける結合状態の安定性に関する従来の理解に異議を唱える.

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