Exciton polaritons, with extremely low effective mass¹, are regarded as promising candidates to realize Bose–Einstein condensation in lattices for quantum simulations² towards room-temperature operations^3,4,5,6,7,8. Along with the condensation, an efficient exciton polariton quantum simulator⁹ would require a strong lattice with robust polariton trapping as well as strong intersite coupling to allow coherent quantum motion of polaritons within the lattice. A strong lattice can be characterized with a larger forbidden bandgap opening and a larger lattice bandwidth compared with the linewidth. However, exciton polaritons in such strong lattices have only been shown to condense at cryogenic temperatures^3,4,5,6,7,8. Here, we report the observation of non-equilibrium exciton polariton condensation in a one-dimensional strong lead halide perovskite lattice at room temperature. Modulated by deep periodic potentials, the strong lead halide perovskite lattice exhibits a large forbidden bandgap opening up to 13.3 meV and a lattice band up to 8.5 meV wide, which are at least 10 times larger than previous systems. Above a critical density, we observe polariton condensation into p_y orbital states with long-range spatial coherence at room temperature. Our result opens the route to the implementation of polariton condensates in quantum simulators at room temperature.

具有极低有效质量^{1 的}激子极化子被认为是实现晶格中玻色-爱因斯坦凝聚的有希望的候选者，以用于室温操作的量子模拟^{2 3,4,5,6,7,8}。除了凝聚之外，有效的激子极化子量子模拟器⁹将需要具有鲁棒极化子俘获的强晶格以及强位间耦合以允许晶格内极化子的相干量子运动。与线宽相比，强晶格的特征可以是更大的禁带隙开口和更大的晶格带宽。然而，这种强晶格中的激子极化子仅在低温^3,4,5,6,7,8下才显示出凝聚. 在这里，我们报告了在室温下在一维强卤化铅钙钛矿晶格中观察到非平衡激子极化子凝聚。在深周期电位的调制下，强卤化铅钙钛矿晶格表现出高达 13.3 meV 的大禁带隙和高达 8.5 meV 宽的晶格带，比以前的系统至少大 10 倍。在临界密度之上，我们观察到极化子凝聚成在室温下具有长程空间相干性的p _{y轨道状态。}我们的结果为在室温下在量子模拟器中实现极化子凝聚体开辟了道路。