From Atomic Defects to Secure Links: Quantum Light Emission in hBN and its Application in QKD

The development of scalable quantum technologies relies on the discovery and engineering of robust single-photon sources. Recently, hexagonal Boron Nitride (hBN) has emerged as a disruptive platform for quantum light generation. Unlike traditional 3D semiconductors, this two-dimensional material hosts bright and stable quantum emitters that operate at room temperature, offering a unique pathway for practical quantum technologies. In this talk, I will discuss the journey of developing hBN-based quantum light sources at the Quantum Photonics Systems Laboratory (QPSLab). We will first explore the fundamental material properties that allow us to isolate and control individual atomic defects. I will then present our recent findings on the optical properties and polarization dynamics of these emitters, which are critical for their effective utilization in quantum systems. Finally, I will demonstrate how these 2D-based sources can be moved from fundamental studies to real-world applications. Specifically, I will present our implementation of Quantum Key Distribution (QKD) protocols using hBN single-photon emitters, highlighting the potential of 2D materials as a viable platform for secure quantum communication.