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The Matrix & Distributed Systems?

Exploring physics-informed machine learning for system matrix formulation in x-ray imaging forward models

(a) Calculate general expressions for time-dependent elements of the density matrix ρi j of a two-level system in first-, second-, and third-order perturbation theory from the equation of motion i ħ(d)/(d t) ρ=[H0, ρ] [V, ρ] i ħ[(d)/(d t) ρ]relaxation . Assume V represents three weak applied light fields. In zeroth order, no light field is present, but V is distinct and nonzero for each successive order of perturbation. That is, V^(0)=0, but V^(1), V^(2), V^(3) ≠0. (b) Solve these equations in