Many-body Rabi oscillations for atoms confined in a state-insensitive optical lattice

Coherent many body Rabi oscillations between the ground state and a collective Rydberg state can be realized in the regime of the Rydberg excitation blockade for a microscopic atomic ensemble. Here we utilize a magic-wavelength optical lattice with the ground-Rydberg coherence time extended up to 30 \mu s to observe such oscillations as a function of driving duration in an ensemble of ~300 atoms. The oscillations are described by a theoretical model which includes a range of decoherence mechanisms.