1. We define the product of operators by composition. That is, AB|4) = A(B|4)). Show that,...

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1. We define the product of operators by composition. That is, AB|4) = A(B|4)). Show that, for the two-level atom, the evolution operator satisfies U(t) U(ts)U(s). 1. We define the product of operators by composition. That is, AB|4) = A(B|4)). Show that, for the two-level atom, the evolution operator satisfies U(t) U(ts)U(s).