标题： 二维波导量子电动力学网络中由平带介导的光子-光子相互作用 显示英文标题

标题： Flat band mediated photon-photon interactions in 2D waveguide QED networks

摘要： 我们研究了量子发射器组成的李伯晶格与二维波导网络耦合的情况，并证明该系统支持一个能量上孤立的平带，使得尽管存在长程光子介导的耦合，仍然能够实现局域化。然后，我们探索了在软核和硬核相互作用区域中的双激发动力学，这些区域来源于发射器的非线性。在软核区域，我们观察到由束缚光子对形成所介导的平带内的相互作用诱导的光子传输。在硬核区域，对应于两能级原子极限，我们反而发现了涉及平坦带和色散带的亚稳态激子似 Dressing 态的出现。我们的发现强调了发射器集体行为与有效光子-光子相互作用之间的相互作用如何为研究平坦带系统中的高度相关光子态提供了一个平台。 显示英文摘要

摘要： We investigate a Lieb lattice of quantum emitters coupled to a two-dimensional waveguide network and demonstrate that this system supports an energetically isolated flat band, enabling localization despite the presence of long-range photon-mediated couplings. We then explore the two-excitation dynamics in both the softcore and hardcore interaction regimes, which arise from the nonlinearity of the emitters. In the softcore regime, we observe interaction-induced photon transport within the flat band, mediated by the formation of bound photon pairs. In the hardcore regime, corresponding to the two-level atom limit, we instead find the emergence of metastable exciton-like dressed states involving both flat and dispersive bands. Our findings highlight how the interplay between the collective behavior of emitters and effective photon-photon interactions can provide a platform for studying highly correlated photonic states in flat-band systems.