<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">PT</mml:mi></mml:math>-Symmetric Feedback Induced Linewidth Narrowing
Yuanjiang Tang(Tsinghua University), Yong‐Chun Liu(State Key Laboratory of Low-Dimensional Quantum Physics), Chao Liang(Tsinghua University), An‐Ning Xu(Tsinghua University), Xin Wen(Hainan University), Weipeng Li(Tsinghua University)
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