Combined Effects of the Electron–Hole Exchange and Förster Energy Transfer Interactions in Self-Assembled Quantum-Dot Pairs

Single-photon emitters are essential components for the development of optical quantum computing and other quantum technologies, and semiconductor quantum dots are one of the most promising systems for scalable implementation of this type of light sources. However, polarization decoherence is still an important challenge to overcome. Herein, the combined influence of the electron–hole exchange and the Förster energy transfer in a pair of laterally coupled self-assembled quantum dots, on the exciton-spin coherence time, is studied. The numerical simulations suggest that under some conditions, the interplay between those two interactions slows the exciton-spin decoherence as compared to the single-dot case, which favors the applicability of quantum dots in quantum light generation devices.