We present a proposal for a tunable source of single photons operating in the terahertz (THz) regime. This scheme transforms incident visible photons into quantum THz radiation by driving a single polar quantum emitter with an optical laser, with its permanent dipole enabling dressed THz transitions enhanced by the resonant coupling to a cavity. This mechanism offers optical tunability of properties such as the frequency of the emission or its quantum statistics (ranging from antibunching to entangled multi-photon states) by modifying the intensity and frequency of the drive. We show that the implementation of this proposal is feasible with state-of-the-art photonics technology.
@article{arxiv.2305.11754,
title = {Single-photon source over the terahertz regime},
author = {Caspar Groiseau and Antonio I. Fernández-Domínguez and Diego Martín-Cano and Carlos Sánchez Muñoz},
journal= {arXiv preprint arXiv:2305.11754},
year = {2024}
}