Multisource on-chip quantum photonics with tunable QDs

Our project aims to develop advanced technology for quantum optical experiments and applications by integrating tiny light sources, known as quantum dots, into specialized optical circuits. These circuits help control and manipulate light at the quantum level, enabling complex operations needed for future quantum devices. One of our key goals is to demonstrate a crucial quantum effect called Hong-Ou-Mandel (HOM) interference, where two particles of light (photons) become indistinguishable and interfere in a way that is fundamental to many quantum technologies. Scientists have already demonstrated this effect with photons from a single source, but doing so with photons from different sources on the same chip is much more challenging. So far, this has only been successfully demonstrated using separate diode structures. Our work will take this a step further by making it possible within a single integrated chip. To make this happen, we are tackling three major challenges: Efficiently guiding light through photonic circuits We need to design high-quality optical circuits that capture and direct photons with minimal loss. Our approach uses a special material, AlGaAs-on-insulator, which provides both strong light confinement and high stability. Creating stable and reliable photon emission Quantum emitters can sometimes "blink" unpredictably or produce photons with slightly different properties. We will integrate state-of- the-art quantum dots into our circuits to ensure they emit consistent, high-quality photons. Making photons from different sources identical For our system to work, photons from different quantum emitters must be nearly indistinguishable. We will use precise tuning methods, including mechanical strain, to adjust their properties and match specific atomic frequency standards, like those used in atomic clocks. By bringing together experts in photonics, quantum optics, and nanotechnology from multiple research institutions, our project aims to push the boundaries of quantum photonics. If successful, this work could pave the way for practical quantum networks and new ways to process and store quantum information.