We demonstrate an elastically-tunable self-assembled quantum dot in a nanowire antenna that emits single photons with resolution-limited spectral linewidths. The single-photon device is comprised of a single quantum dot embedded in a top-down fabricated nanowire waveguide integrated onto a piezoelectric actuator. Non-resonant excitation leads to static (fluctuating) charges likely at the nanowire surface, causing DC Stark shifts (inhomogeneous broadening); for low excitation powers, the effects are not observed and resolution-limited linewidths are obtained. Despite significant strain-field relaxation in the high-aspect-ratio nanowires, we achieve up to 1.2 meV tuning of a dot's transition energy. Single-photon sources with high brightness, resolution-limited linewidths, and wavelength tunability are promising for future quantum technologies.
@article{arxiv.1411.2654,
title = {A strain-tunable quantum dot embedded in a nanowire antenna},
author = {P. E. Kremer and A. C. Dada and P. Kumar and Y. Ma and S. Kumar and E. Clarke and B. D. Gerardot},
journal= {arXiv preprint arXiv:1411.2654},
year = {2016}
}