# Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide

## TL;DR

This paper demonstrates a highly efficient, demultiplexed single-photon source based on a quantum dot in a nanophotonic waveguide, capable of producing multiple photons with high rate and efficiency, advancing quantum photonics applications.

## Contribution

It introduces a scalable, active demultiplexing scheme for quantum dot single-photon sources with high outcoupling and end-to-end efficiency, enabling multi-photon generation.

## Key findings

- Achieved >60% outcoupling efficiency into single-mode fibers.
- Demonstrated active demultiplexing into 4 channels with >81% efficiency.
- Produced >1 Hz four-photon coincidence rates under non-resonant excitation.

## Abstract

Planar nanostructures allow near-ideal extraction of emission from a quantum emitter embedded within, thereby realizing deterministic single-photon sources. Such a source can be transformed into M single-photon sources by implementing active temporal-to-spatial mode demultiplexing. We report on the realization of such a demultiplexed source based on a quantum dot embedded in a nanophotonic waveguide. Efficient outcoupling (>60%) from the waveguide into a single mode optical fiber is obtained with high-efficiency grating couplers. As a proof-of-concept, active demultiplexing into M=4 spatial channels is demonstrated by the use of electro-optic modulators with an end-to-end efficiency of >81% into single-mode fibers. Overall we demonstrate four-photon coincidence rates of >1 Hz even under non-resonant excitation of the quantum dot. The main limitation of the current source is the residual population of other exciton transitions that corresponds to a finite preparation efficiency of the desired transition. We quantitatively extract a preparation efficiency of 15% using the second-order correlation function measurements. The experiment highlights the applicability of planar nanostructures as efficient multiphoton sources through temporal-to-spatial demultiplexing and lays out a clear path way of how to scale up towards demonstrating quantum advantages with the quantum dot sources.