Improving indistinguishability of single photons from colloidal quantum dots using nanocavities

TL;DR

This paper presents a practical method to produce indistinguishable single photons from colloidal quantum dots at room temperature by coupling them to silicon nitride nanocavities, enhancing their quantum emission quality.

Contribution

It introduces a novel coupling technique with nanocavities to improve photon indistinguishability from colloidal quantum dots, addressing a key challenge at room temperature.

Findings

Coupling quantum dots to silicon nitride cavities enhances photon indistinguishability.

The method achieves performance comparable to defect centers and self-assembled quantum dots.

Experimental feasibility demonstrated with solution-processed colloidal quantum dots.

Abstract

Colloidal quantum dots have garnered active research interest as quantum emitters due to their robust synthesis process and straightforward integration with nanophotonic platforms. However, obtaining indistinguishable photons from the colloidal quantum dots at room temperature is fundamentally challenging because they suffer from an extremely large dephasing rate. Here we propose an experimentally feasible method of obtaining indistinguishable single photons from an incoherently pumped solution-processed colloidal quantum dot coupled to a system of nanocavities. We show that by coupling a colloidal quantum dot to a pair of silicon nitride cavities, we can obtain comparable performance of a single photon source from colloidal quantum dots as other leading quantum emitters like defect centers and self-assembled quantum dots.