“Semiconductor nanostructures producing single photons, twins and triplets for quantum photonics”
While photonics is an established area of technology covering optical communication, manufacturing, sensing, and many other fields of application, hardly any of its methods actually make use of the quantization of light. Quantum photonics applications, on the other hand, explicitly build on the quantum properties of light to realize secure key distribution, optical quantum computing, and quantum computer networks.
Sources of quantum states of light are important building blocks of such quantum photonic systems. Traditionally these sources were realized using nonlinear optical techniques in conventional optical laboratory setups but for any real world applications, it is clear that we need to achieve miniaturization and integration. In our work, we employ single semiconductor quantum dots, nanowires, and waveguides to implement sources of single photons, entangled photon pairs and even triplets of photons. While there are still many open research questions, these sources have the potential to make quantum photonics a practical reality.