Light–matter interactions can create and manipulate collective many-body phases in solids^1,2,3, which are promising for the realization of emerging quantum applications. However, in most cases, these collective quantum states are fragile, with a short decoherence and dephasing time, limiting their existence to precision tailored structures under delicate conditions such as cryogenic temperatures and/or high magnetic fields. In this work, we discovered that the archetypal hybrid perovskite, MAPbI₃ thin film, exhibits such a collective coherent quantum many-body phase, namely superfluorescence, at 78 K and above. Pulsed laser excitation first creates a population of high-energy electron–hole pairs, which quickly relax to lower energy domains and then develop a macroscopic quantum coherence through spontaneous synchronization. The excitation fluence dependence of the spectroscopic features and the population kinetics in such films unambiguously confirm all the well-known characteristics of superfluorescence. These results show that the creation and manipulation of collective coherent states in hybrid perovskites can be used as the basic building blocks for quantum applications^4,5.

光与物质的相互作用可以创造和操纵固体中的集体多体相^1,2,3，这对于实现新兴的量子应用很有希望。然而，在大多数情况下，这些集体量子态是脆弱的，退相干和相移时间短，限制了它们在低温和/或高磁场等微妙条件下的精确定制结构的存在。在这项工作中，我们发现原型混合钙钛矿 MAPbI ₃薄膜，在 78 K 及以上表现出这样的集体相干量子多体相，即超荧光。脉冲激光激发首先产生大量高能电子-空穴对，它们迅速弛豫到低能域，然后通过自发同步发展出宏观量子相干性。这种薄膜中光谱特征的激发通量依赖性和群体动力学明确地证实了超荧光的所有众所周知的特征。这些结果表明，混合钙钛矿中集体相干态的创建和操纵可以用作量子应用^4,5的基本构建块。