Cavity Quantum Electrodynamics (CQED) is a field of study that explores the interaction between light and matter at the quantum level. It typically involves a small cavity, often formed by mirrors, where atoms or quantum dots can interact with photons. This setup allows researchers to observe and manipulate quantum states, leading to advancements in quantum information processing and communication. In CQED, the properties of the cavity enhance the coupling between the light and the matter, enabling phenomena such as strong coupling and quantum entanglement. This research has implications for developing technologies like quantum computers and quantum networks, which rely on precise control of quantum states.