Effect of temperature and phonons on the spectral properties of a multi-level semiconductor quantum dot single-photon source

Since it was realized that efficient quantum computing can be performed using single photons and standard linear optics elements, immense international research activity has been aimed at developing semiconductor quantum dot (QD) single-photon sources (SPS). In order to optimise the design of SPS for high efficiency as well as increase the understanding of the physics, advanced and accurate models are needed that describes the complex solid-state environment the SPS is part of. This paper investigates a many-body model of a SPS based on the non-equilibrium Green´s function formalism (NEGF), where the most important many-body interactions occurring in a semiconductor, namely the electron- phonon, electron-photon, and electron-electron interaction are included. The novel part of the model is that both longitudinal optical (LO) and acoustical (LA) phonons in the NEGF model are included, which allows us to study complicated multi-level QDs, not possible within the commonly used independent boson model (IBM).