Collective emission of matter-wave jets from driven Bose–Einstein condensates. Ultracold chemistry and its reaction kinetics. Quantum effects on the dynamics of a two-mode atom-molecule Bose-Einstein condensate. Bose-enhanced chemistry: amplification of selectivity in the dissociation of molecular Bose-Einstein condensates. Coherent reaction between molecular and atomic Bose-Einstein condensates: integrable model. Superchemistry: dynamics of coupled atomic and molecular Bose-Einstein condensates. Transition from an atomic to a molecular Bose–Einstein condensate. A degenerate Fermi gas of polar molecules. BCS–BEC crossover: from high temperature superconductors to ultracold superfluids. Precision test of statistical dynamics with state-to-state ultracold chemistry. Controlled state-to-state atom-exchange reaction in an ultracold atom–dimer mixture. State-to-state chemistry for three-body recombination in an ultracold rubidium gas. Assembly of a rovibrational ground state molecule in an optical tweezer. Observation of dipolar spin-exchange interactions with lattice-confined polar molecules. Ultracold photoassociation spectroscopy: long-range molecules and atomic scattering. Production of cold molecules via magnetically tunable Feshbach resonances. Our findings deepen our understanding of quantum many-body chemistry and offer insights into the control of chemical reactions at quantum degeneracy. We present a quantum field model that captures the dynamics well and allows us to identify three-body recombination as the dominant reaction process. We observe faster oscillations in samples with higher densities, indicating bosonic enhancement. Starting from an atomic condensate, the reaction begins with the rapid formation of molecules, followed by oscillations of their populations during the equilibration process. Here we report the observation of coherent and collective reactive coupling between Bose-condensed atoms and molecules near a Feshbach resonance. However, the observation of these many-body phenomena, also known as ‘superchemistry’, has been elusive so far.

In many-body reactions involving bosonic reactants and products, such as coupled atomic and molecular Bose–Einstein condensates, quantum coherence and bosonic enhancement are key features of the reaction dynamics. Chemical reactions in the quantum degenerate regime are described by the mixing of matter-wave fields.

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