A dressed state is defined as an eigenstate of the total Hamiltonian, including interactions. Once these dressed states are found, and their energies known, the dynamics of the system is simple: the total state is a superposition of these states, the amplitudes being constant. The dressed states are derived for a two-state system, a three-state system and the Bixon–Jortner model. Dissipative systems are treated using Fano theory. Related techniques, suited to the Heisenberg picture, involve dressed operators. Two examples of physical interest are discussed: an imperfect cavity, and the Jaynes–Cummings model.
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