Molecular quantum gases have many potential applications, including quantum control of chemical reactions, precision measurements, quantum simulation and quantum information processing. In particular reaction dynamice is expected to be fundamentally different in the quantum many-body regime. Here we report the observation of coherent reactions between Bose condensed atoms and molecules in an optical trap, The trap geometry and the low temperature of the molecules help to reach atom-molecule equilibrium. From the equation-of-state measurement, we determine the molecular scattering length to be + 220(±30) Bohr radii. We also investigate the unpairing dynamics in the strong coupling regime and find that near the Feshbach resonance the dynamical timescale is consistent with the quantum unitarity limit. Our work demonstrates the long-sought coherent and collective coupling between atomic and molecular condensates.

Coherent reaction dynamice of ultracold atoms and molecules in the quantum degeneracy regime

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ACS Fall 2022

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