text: It's not a quantum dot, but the Mollow triplet was first observed in the fluorescence spectrum of a system of this type driven by a laser.
full_question: It's not a quantum dot, but the Mollow triplet was first observed in the fluorescence spectrum of a system of this type driven by a laser. For a system of this type, the equations of motion for the density matrix are the optical Bloch equations. The interaction between this type of system and a single mode of an electromagnetic cavity is described by the Jaynes-Cummings model. Under certain conditions, the probability of a non-adiabatic transition in this type of system is given by the Landau- Zener formula. When a system of this kind is excited with a sinusoidal perturbation, such as laser light, it will undergo periodic transitions known as Rabi oscillations. In a system of this kind, the probability of absorption can never be higher than the probability of stimulated emission, so achieving population inversion is impossible. The spin states of a spin-1/2 atom are an example of, for 10 points, what type of quantum system consisting of a ground state and a single excited state?
first_sentence: It's not a quantum dot, but the Mollow triplet was first observed in the fluorescence spectrum of a system of this type driven by a laser.
raw_answer: two-level system [or two-state system; or two-level atom; prompt on "atom"]