Incoherent pumping in quantum dots (QDs) can create a biexciton state through two paths: via the formation of bright or dark exciton states. The latter, dark-pumping, path is shown to enhance the probability of two-photon simultaneous emission, and hence increase g(2)(0) by a factor ∝1/γS, due to the slow spin relaxation rate γS in QDs. The existence of the dark path is shown to impose a limitation on the single photon (SP) emission process, especially in nanocavities which exhibit a large exciton-cavity coupling and a Purcell enhancement for fast quantum telecommunications.
@article{arxiv.1405.2661,
title = {Impact of the dark path on quantum dot single photon emitters in small cavities},
author = {Kenji Kamide and Satoshi Iwamoto and Yasuhiko Arakawa},
journal= {arXiv preprint arXiv:1405.2661},
year = {2014}
}