Advanced architectures for coupling III-V nanowires to photonic integrated circuitry

TL;DR

This paper presents a hybrid nanowire device with embedded quantum dots that efficiently couples single-photon emission into photonic circuits, enabling multi-directional quantum light sources for integrated quantum photonics.

Contribution

It introduces a novel hybrid device architecture that uses evanescent coupling to recover single photons from quantum dots embedded in nanowires, advancing on-chip quantum photonic integration.

Findings

Successful demonstration of single-photon emission from both ends of the nanowire.

Observation of cascaded XX-X emission from different facets.

Validation of multi-directional quantum emitter integration.

Abstract

This work implements a hybrid device based on a semiconductor quantum dot embedded within a nanowire to bridge a non-continuous curved waveguide structure. The geometry takes advantage of evanescent coupling between the photonic structures to recover single photons emitted from both outputs of the device. Auto- and cross-correlation measurements were performed on different output facets of the device. We demonstrate single-photon emission from both ends of the nanowire for both neutral, X and XX, and charged X-, excitonic complexes. We further demonstrate the cascaded XX-X emission by collecting each complex from a different facet. This work lays the foundation for on-chip architectures which utilize multi-directional integration of quantum emitters.