All-optical tailoring of single-photon spectra in a quantum-dot microcavity system

TL;DR

This paper demonstrates that the spectral properties of single photons emitted from a quantum-dot cavity system can be fully controlled using an all-optical method involving a stimulating laser pulse, enabling customizable quantum light sources.

Contribution

It introduces a novel all-optical approach to tailor the frequency and linewidth of single photons emitted from a quantum-dot system, surpassing fixed spectral characteristics.

Findings

Frequency and linewidth of single photons can be controlled by the stimulating laser.

All-optical spectral shaping of single photons is feasible in quantum-dot systems.

The method enables on-demand customization of photon spectra for quantum communication.

Abstract

Semiconductor quantum-dot cavity systems are promising sources for solid-state based on-demand generation of single photons for quantum communication. Commonly, the spectral characteristics of the emitted single photon are fixed by system properties such as electronic transition energies and spectral properties of the cavity. In the present work we study single-photon generation from the quantum-dot biexciton through a partly stimulated non-degenerate two-photon emission. We show that frequency and linewidth of the single photon can be fully controlled by the stimulating laser pulse, ultimately allowing for efficient all-optical spectral shaping of the single photon.