# Mode-Matched Resonant Excitation of a Nanowire Quantum Dot in a Nanophotonic Waveguide

## TL;DR

Researchers developed a method to coherently excite nanowire quantum dots using a nanophotonic waveguide, improving single-photon emission for quantum technologies.

## Contribution

A reliable technique for resonant excitation of quantum dots using mode-matching and polarization-rejection in a nanowire waveguide.

## Key findings

- Low multiphoton emission was achieved with g^(2)(0) = 0.019.
- Multiple Rabi oscillations were observed under pulsed resonant excitation.
- Two-photon indistinguishability reached 41% interference visibility.

## Abstract

Nanowire-based quantum
dots as sources of single photons are promising
candidates for the implementation of quantum photonic technologies.
Achieving coherent control of these sources is essential for generating
indistinguishable single photonsa key requirement for quantum
interference. However, coherent excitation of nanowire quantum dots
via resonant pumping has remained a long-standing challenge due to
high laser suppression requirements. Here we establish a reliable
technique to implement resonant excitation of a quantum dot in a tapered
single-mode nanowire waveguide by complementing polarization–rejection
with mode-matching to minimize the amount of backscattered laser.
We demonstrate low multiphoton emission [g

X

(2)(0) = 0.019] and multiple Rabi oscillations under pulsed resonant
excitation. We also report on two-photon indistinguishability under
resonant excitation, achieving an interference visibility of 41%.
This is a significant improvement over incoherent excitation and represents
an important step in the development of a scalable approach for producing
coherent single-photon sources.