Efficient broadband antenna for a quantum emitter working at telecommunication wavelengths

TL;DR

This paper proposes a broadband optical antenna designed for quantum dots emitting at telecommunication wavelengths, enhancing photon extraction efficiency and mode quality for quantum network applications.

Contribution

It introduces a novel broadband antenna structure optimized for O-band quantum emitters, addressing the need for efficient telecom-wavelength quantum light sources.

Findings

High extraction efficiency with small Purcell enhancement (~2)

Gaussian mode profile observed in far-field emission

Suitable for quantum network integration at telecom wavelengths

Abstract

Single photons are resources needed for developing quantum networks QN. They distribute quantum information services across commercial optical fiber links and are key ingredient in developing quantum repeaters architectures. Currently, the most robust quantum light sources are Quantum Dots made of III-V materials. They emit highly indistinguishable photons on-demand and with high efficiency. Established devices work at near-infrared wavelengths (NIR) and further research is needed to develop devices working in telecommunication wavelengths O- and S-bands. In this contribution, we propose and model a broadband optical antenna working in O-band. It exhibits high extraction efficiencies with small Purcell enhancement around 2. We also examine far field emission from these structures, ensuring Gaussian mode profile is observed.