Converting single photons from an InAs/GaAs quantum dot into the ultraviolet: preservation of second-order correlations

TL;DR

This paper demonstrates the successful wavelength conversion of single photons emitted from a quantum dot from infrared to ultraviolet while preserving their quantum correlations, enabling integration of diverse quantum devices.

Contribution

It presents the first demonstration of sum frequency conversion of quantum dot photons to UV wavelengths with preserved second-order correlations.

Findings

Single photons from a quantum dot were converted from 853nm to 370nm.

Second-order correlation functions were preserved after conversion.

The process enables integration of quantum emitters with UV-based quantum systems.

Abstract

Wavelength conversion at the single-photon level is required to forge a quantum network from distinct quantum devices. Such devices include solid-state emitters of single or entangled photons, as well as network nodes based on atoms or ions. Here we demonstrate the conversion of single photons emitted from a III-V semiconductor quantum dot at 853nm via sum frequency conversion to the wavelength of the strong transition of Yb ions at 370nm. We measure the second-order correlation function of both the unconverted and of the converted photon and show that the single-photon character of the quantum dot emission is preserved during the conversion process.