Ultra-coherent single photon source

TL;DR

This paper introduces an ultra-coherent solid-state single photon source using resonant laser excitation of a quantum dot, achieving highly indistinguishable photons for quantum device applications.

Contribution

It presents a novel single photon source with tailored coherence via resonant excitation, surpassing previous linewidth limitations.

Findings

Spectral linewidth below the radiative limit

High degree of photon indistinguishability

Potential for integrated quantum devices

Abstract

We present a novel type of single photon source in solid state, based on the coherent laser light scattering by a single InAs quantum dot. We demonstrate that the coherence of the emitted single photons is tailored by the resonant excitation with a spectral linewidth below the radiative limit. Our ultra-coherent source opens the way for integrated quantum devices dedicated to the generation of single photons with high degrees of indistinguishability.