We study the controllability of a linear KdV-Schrödinger equation on the one-dimensional torus via purely imaginary bilinear controls. Considering controls spanning a suitable finite number of Fourier modes, we prove small-time global approximate controllability in L2 (T). The result holds between any pair of states with the same norm and is obtained via the saturation method by following the idea introduced in Poz24. We first establish small-time controllability for phase multiplications, and then generate transport operators associated with diffeomorphisms of the torus. Finally, we combine these results to recover global approximate controllability. Note that the controllability property holds independently of the Schrödinger component of the dynamics, which may in particular be taken to vanish.
Buffe et al. (Tue,) studied this question.