We demonstrate systematic resonance fluorescence recovery with near-unity emission efficiency in single quantum dots embedded in a charge-tunable device in a wave-guiding geometry. The quantum dot charge state is controlled by a gate voltage, through carrier tunneling from a close-lying Fermi sea, stabilizing the resonantly photocreated electron-hole pair. The electric field cancels out the charging/discharging mechanisms from nearby traps toward the quantum dots, responsible for the usually observed inhibition of the resonant fluorescence. Fourier transform spectroscopy as a function of the applied voltage shows a strong increase of the coherence time though not reaching the radiative limit. These charge controlled quantum dots act as quasi-perfect deterministic single-photon emitters, with one laser pulse converted into one emitted single photon.
@article{arxiv.1710.09732,
title = {Resonance fluorescence revival in a voltage-controlled semiconductor quantum dot},
author = {Antoine Reigue and Aristide Lemaître and Carmen Gomez Carbonell and Christian Ulysse and Kamel Merghem and Stéphane Guilet and Richard Hostein and Valia Voliotis},
journal= {arXiv preprint arXiv:1710.09732},
year = {2018}
}