Solution of the quantum inverse problem

We derive a formula that expresses the local spin and held operators of fun damental graded models in terms of the elements of the monodromy matrix. Th is formula is a quantum analogue of the classical inverse scattering transf orm. It applies to fundamental spin chains, such as the XYZ chain, and to a number of important exactly solvable models of strongly correlated electro ns, such as the supersymmetric t-J model or the EKS model.