This course explores the fundamental concepts of quantum optics with a particular focus on two-photon and multiphoton phenomena, and is taught by Professor Alain Aspect. Throughout the course, learners are introduced to topics such as the quantum nature of light, photon correlations, entanglement, and several important experiments and phenomena in quantum optics. It is suitable for those with a basic background in quantum mechanics and optics who want to develop a deeper understanding of light in the quantum regime and the behavior of multiphoton systems.