Quantum Plasmonic Dynamics Modeled via a Modified Langevin Noise Formalism: Numerical Studies of Single‐Photon Emission and Two‐Photon Interference

ABSTRACT

Recent studies have established and rigorously validated a modified Langevin noise formalism that enables macroscopic‐QED‐based quantization of electromagnetic fields in open and dissipative environments. Building on this foundation, a multimode Jaynes–Cummings framework has been developed and verified, providing an accurate description of atom–field interactions in lossy and radiative systems. In this work, we explore the potential of this formalism for nanophotonic applications by modeling representative quantum–plasmonic dynamics. In particular, we present detailed numerical examples for (i) two‐photon interference mediated by a quantum plasmonic beam splitter, and (ii) non‐Markovian dynamics of an atom located in plasmonic antennas and corresponding directional control of out‐coupled single‐photon fields. These results illustrate how the proposed modeling approach can provide quantitative insight into the behavior of plasmonic single‐photon sources and beam‐splitting structures.