Аннотация:An inverse spectral optimization problem is considered: given a matrix potential Q_0(x) and a value λ*, find a matrix function Q(x) closest to Q_0(x) such that the kth eigenvalue of the Sturm–Liouville matrix operator with potential Q(x) matches λ*. The main result of the paper is the proof of existence and unique- ness theorems. Explicit formulas for the optimal potential are established through solutions to systems of second-order nonlinear differential equations known in mathematical physics as systems of nonlinear Schrödinger equations.