Purcell enhanced and indistinguishable single-photon generation from quantum dots coupled to on-chip integrated ring resonators

TL;DR

This paper demonstrates a scalable on-chip single-photon source using quantum dots coupled to integrated ring resonators, achieving Purcell enhancement, coherent control, and high-quality photon emission for quantum technologies.

Contribution

It introduces a monolithic GaAs ring cavity with quantum dots, achieving Purcell enhancement and high-quality single-photon emission on-chip, advancing integrated quantum photonics.

Findings

Over twofold spontaneous emission rate enhancement via Purcell effect

On-demand single-photon generation with 1% multi-photon probability

Two-photon interference visibility up to 95%

Abstract

Integrated photonic circuits provide a versatile toolbox of functionalities for advanced quantum optics applications. Here, we demonstrate an essential component of such a system in the form of a Purcell enhanced single-photon source based on a quantum dot coupled to a robust on-chip integrated resonator. For that, we develop GaAs monolithic ring cavities based on distributed Bragg reflector ridge waveguides. Under resonant excitation conditions, we observe an over twofold spontaneous emission rate enhancement using Purcell effect and gain a full coherent optical control of a QD-two-level system via Rabi oscillations. Furthermore, we demonstrate an on-demand single-photon generation with strongly suppressed multi-photon emission probability as low as 1% and two-photon interference with visibility up to 95%. This integrated single-photon source can be readily scaled up, promising a realistic pathway for scalable on-chip linear optical quantum simulation, quantum computation and quantum networks.