Dressed states are quantum mechanical states that describe a system of a two-level atom interacting with an external electromagnetic field, where the atom's energy levels are modified by the field. This concept captures how an atom can be simultaneously in different energy states, leading to phenomena such as Rabi oscillations, and highlights the coupling between light and matter. By representing the interaction between the atomic system and the external field, dressed states provide insights into various quantum systems, including those in cavity environments.
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