Dicke physics describes the cooperative interaction of many quantum emitters with a common radiation field, producing collective optical states whose absorption and emission rates can exceed those of independent particles. Although superradiance and superabsorption are central ideas in quantum optics, their realization in room-temperature semiconductor nanocrystals is normally considered difficult because disorder, phonon coupling, and dephasing should destroy collective phase coherence. Lead-halide perovskite quantum dots challenge this expectation.

Here we discuss perovskite quantum dots as a room-temperature platform for Dicke many-body optics. We first summarize our observation of superradiant emission from perovskite quantum dots, representing the first experimental observation of superradiance in this material class. These results show that cooperative emission is not merely a low-temperature atomic or molecular phenomenon, but can emerge in strongly lattice-coupled colloidal semiconductor nanocrystals.

We then present a microscopic theory of Dicke superradiance and superabsorption in perovskite quantum dots. The theory identifies the regimes in which collective absorption or collective emission dominates, yielding phase diagrams that connect oscillator strength, dephasing, dot size, excitation density, and exciton–lattice coupling. In this framework, superradiance and superabsorption are not separate phenomena, but opposite directions of the same cooperative light–matter interaction.

Finally, we show that superabsorption can be generated dynamically on ultrafast timescales. In this regime, the optical response is not governed by conventional population inversion. Instead, a transient cooperative many-body state forms with enhanced phase-coherent light–matter coupling. This produces a gain-like quantum-optical response without the usual requirement of exciton or biexciton population inversion. The mechanism is therefore distinct from standard quantum-dot optical gain, where amplification is constrained by excited-state absorption, biexciton formation, and Auger recombination.

These results establish perovskite quantum dots as dynamically programmable Dicke systems. More broadly, they suggest that soft, strongly polar semiconductor nanocrystals can support room-temperature cooperative quantum optics, opening routes toward quantum-enhanced light harvesting, ultrafast optical amplification, and solid-state quantum photonic materials.