The Quantum Photonics Group (QPG) is a laboratory within the Applied Physics Department at the California Institute of Technology focusing on the physics and applications of quantum photonic devices. Led by Professor Oskar Painter, research within the QPG focuses on several inter-related topics — superconducting quantum circuits for quantum information processing and quantum simulation, the quantum physics of mesoscopic mechanical objects, hybrid superconducting and acoustic quantum circuits, and precision optomechanical sensors. The QPG facilities consist of laboratories for optical, microwave, and cryogenic experiments, and a state-of-the-art nanofabrication facility for the in-house development of devices.