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Cavity QED and chip-scale nanophotonics constitute the keystones to the future of quantum information processing and communication. One of the foremost processes underpinning quantum photonic technologies is the phenomenon of Rabi oscillations wherein a qubit is irradiated by a coherent light source. In contrast to this conventional setting, in this talk, we expound on the more general case where the optical excitation is the multiphoton Fock state which is a fundamental building block for the photonic Hilbert space. By employing the real-space approach in waveguide QED, we analytically explore the scattering dynamics of the photonic Fock state as it interfaces with a two-level emitter. Our analysis extends the results on single-mode Rabi oscillations pertinent to cavity QED, to the paradigmatic, multimode, waveguide-QED models where flying photons are the essential information carriers. The temporal …