史保森教授、丁冬生教授等人一直致力于光與原子的相互作用的研究,利用克爾非線性效應在實驗上實現了無腔的光學隔離器和環形器[Phys. Rev. Research 2, 033517(2020)],證明了利用熱原子氣室可以實現弱光下的四通道光學環形器。在此基礎上,他們開展了單光子條件下的非互易研究:利用冷原子系統產生了標記單光子,并將單光子作為信息載體入射到熱原子隔離器,基于電磁感應透明和拉曼躍遷兩種機制實現了真實單光子的雙向非互易傳輸,隔離度為22.5+/-0.1dB,帶寬達數百兆赫茲。除此之外,他們還實現了多頻段復用的光學非互易,從而拓展了可實現非互易的信號頻段范圍。該實驗研究利用常見的多普勒效應,具有普適性,并且由于熱原子汽室本身不涉及磁場,器件簡易,易于實現小型化、集成化,因此該結果在實際可集成化的經典和量子信息處理過程中具有潛在應用價值。
圖1. 原子熱運動誘導的光學非互易原理示意圖和實驗裝置圖
圖2. 單光子非互易實驗結果
量子信息重點實驗室博士后董明新為論文作者,通訊作者為我校史保森教授、丁冬生教授和南京大學夏可宇教授。這項工作得到了國家自然科學委、、重點研發計劃和安徽省引導專項的支持。
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