Cavity quantum electrodynamics (cavity QED) is a field of physics that studies the interactions between light (photons) and matter (typically atoms or quantum dots) confined in a small cavity or resonator. The essential idea is to control and enhance the interaction between light and matter by using a cavity, which can trap photons and force them to interact more strongly with the quantum systems placed inside.
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Cavity quantum electrodynamics studies chemical atoms interacting with an electromagnetic field confined in a cavity, including regimes where a single photon appreciably affects the dynamics.
