Super-radiant emission from quantum dots in a nanophotonic waveguide

TL;DR

This paper demonstrates super-radiant emission from two distant quantum dots integrated into a nanophotonic waveguide, showing long-range quantum interactions crucial for scalable on-chip quantum photonic devices.

Contribution

It introduces a method to achieve quantum interactions between distant quantum dots on a chip using a nanophotonic waveguide with thermal tuning to overcome spectral mismatch.

Findings

Observation of super-radiant emission from two quantum dots

Successful long-range quantum interaction via photon mediation

Use of on-chip thermal tuners to align quantum dot emission frequencies

Abstract

Future scalable photonic quantum information processing relies on the ability of integrating multiple interacting quantum emitters into a single chip. Quantum dots provide ideal on-chip quantum light sources. However, achieving quantum interaction between multiple quantum dots on-a-chip is a challenging task due to the randomness in their frequency and position, requiring local tuning technique and long-range quantum interaction. Here, we demonstrate quantum interactions between distant two quantum dots on a nanophotonic waveguide. We achieve a photon-mediated long-range interaction by integrating the quantum dots to the same optical mode of a nanophotonic waveguide and overcome spectral mismatch by incorporating on-chip thermal tuners. We observe their quantum interactions of the form of super-radiant emission, where the two dots collectively emit faster than each dot individually. Creating super-radiant emission from integrated quantum emitters could enable compact chip-integrated photonic structures that exhibit long-range quantum interactions. Therefore, these results represent a major step towards establishing photonic quantum information processors composed of multiple interacting quantum emitters on a semiconductor chip.