The Hybrid Quantum Systems Research Laboratory (HQSRL) at the Korea Research Institute of Standards and Science (KRISS) explores the fundamental physics arising from the hybridization of different quantum systems and their practical applications. Our research encompasses a variety of quantum device platforms, including superconducting microwave quantum circuits, nanophotonic devices, and nanoelectromechancial systems. We fabricate our devices using nanofabrication facilities at KRISS nanofab and perform device characterization with various microwave and optical tools under atmospheric and cryogenic conditions. Through these efforts, we aim to develop quantum transducers for microwave-to-optical frequency conversion, quantum phononic/acoustic devices, nonlinear superconducting microwave circuits, and NEMS-based photonic devices, paving the way for advancing quantum information processing and quantum sensing.