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Cavity Quantum Electrodynamics (QED) is an open quantum system where its quantum dynamics lend themselves to detailed studies. We measure the quantum speed of the field state evolution in a weakly driven optical Cavity QED system. The system operates in the intermediate regime of cavity QED where the single atom dipole coupling to the mode of the cavity is comparable to the decay rate of the cavity and the spontaneous emission rate. We consider the mode of the electromagnetic field as the quantum system of interest, with a preferential coupling to a tunable environment: the atoms. By changing the number of atoms coupled to the optical cavity mode, we have realized an environment-assisted speed-up: the quantum speed of the state re-population in the optical cavity increases with the coupling strength between the optical cavity mode and this non-Markovian environment (the number of atoms). We find a non-linear relationship between the quantum speed and the number of atoms in the system. Host: Sebastian Deffner |