Nonlinear down-conversion in a single quantum dot

Abstract

Photonic quantum technologies${}^1$, with applications in quantum communication, sensing as well as quantum simulation and computing, are on the verge of becoming commercially available. One crucial building block are tailored nanoscale integratable quantum light sources, matching the specific needs of use-cases. Several different approaches to realize solid-state quantum emitters${}^2$ with high performance${}^3$ have been pursued. However, the properties of the emitted single photons are always defined by the individual quantum light source and despite numerous quantum emitter tuning techniques${}^{4-7}$, scalability is still a major challenge. Here we show an emitter-independent method to tailor and control the properties of the single photon emission. We demonstrate a laser-controlled down-conversion process from an excited state of a quantum three-level system${}^8$. Starting from a biexciton state, a tunable control laser field defines a virtual state in a stimulated process. From there, spontaneous emission to the ground state leads to optically controlled single photon emission. Based on this concept, we demonstrate energy tuning of the single photon emission with a control laser field. The nature of the involved quantum states furthermore provides a unique basis for the future control of polarization and bandwidth, as predicted by theory${}^{9,10}$. Our demonstration marks an important step towards tailored single photon emission from a photonic quantum system based on quantum optical principles.

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Cited by in corpus (5)

• Double-Pulse Generation of Indistinguishable Single Photons with Optically Controlled Polarization
• Swing-up dynamics in quantum emitter cavity systems
• Time-bin entanglement in the deterministic generation of linear photonic cluster states
• Microscopic approach to the quantized light-matter interaction in semiconductor nanostructures: Complex coupled dynamics of excitons, biexcitons, and photons
• Using the Autler-Townes and ac Stark effects to optically tune the frequency of indistinguishable single-photons from an on-demand source