For a large class of operators A, not necessarily local, it is proved that the Cauchy problem of the Schrödinger equation: - d^2f(z)/dz^2 + Af(z) = s^2f(z), f(0)=0, f'(0)=1 possesses a unique solution in the Hilbert (H_2(Δ)) and Banach (H_1(Δ)) spaces of analytic functions in the unit disc Δ = {z: |z| < 1}.