We demonstrate a single-photon source based on a quantum dot in a micropost microcavity that exhibits a large Purcell factor together with a small multi-photon probability. For a quantum dot on resonance with the cavity, the spontaneous emission rate is increased by a factor of five, while the probability to emit two or more photons in the same pulse is reduced to 2% compared to a Poisson-distributed source of the same intensity. In addition to the small multi-photon probability, such a strong Purcell effect is important in a single-photon source for improving the photon outcoupling efficiency and the single-photon generation rate, and for bringing the emitted photon pulses closer to the Fourier transform limit.
@article{arxiv.quant-ph/0307025,
title = {Enhanced single-photon emission from a quantum dot in a micropost microcavity},
author = {Jelena Vuckovic and David Fattal and Charles Santori and Glenn Solomon and Yoshihisa Yamamoto},
journal= {arXiv preprint arXiv:quant-ph/0307025},
year = {2009}
}