Independent operation of two waveguide-integrated quantum emitters

TL;DR

This paper demonstrates the resonant excitation and interference of two quantum dots integrated on a chip, advancing scalable on-chip single-photon sources for quantum photonics.

Contribution

It introduces a method to electrically tune and excite two quantum dots in a photonic circuit, achieving high-visibility two-photon interference.

Findings

Two quantum dots are electrically tuned to the same wavelength.

Achieved two-photon interference visibility of 79%.

Demonstrated on-chip resonant excitation of multiple quantum emitters.

Abstract

We demonstrate the resonant excitation of two quantum dots in a photonic integrated circuit for on-chip single-photon generation in multiple spatial modes. The two quantum dots are electrically tuned to the same emission wavelength using a pair of isolated $p$-$i$-$n$ junctions and excited by a resonant pump laser via dual-mode waveguides. We demonstrate two-photon quantum interference visibility of $(79\pm2)\%$ under continuous-wave excitation of narrow-linewidth quantum dots. Our work solves an outstanding challenge in quantum photonics by realizing the key enabling functionality of how to scale-up deterministic single-photon sources.