Abstract

The aim of this work is to study the controllability of the bilinear Schrödinger equation on compact graphs. In particular, we consider the equation $(BSE)$ $i\partial_t\psi=-\Delta\psi+u(t)B\psi$ in the Hilbert space $L^2(\mathscr{G},\mathbb{C})$, with $\mathscr{G}$ being a compact graph. The Laplacian $-\Delta$ is equipped with self-adjoint boundary conditions, $B$ is a bounded symmetric operator, and $u\in L^2((0,T),\mathbb{R})$ with $T>0$. We provide a new technique leading to the global exact controllability of $(BSE)$ in $D(|\Delta|^{s/2})$ with $s\geq 3$. Afterwards, we introduce the “energetic controllability,” a weaker notion of controllability useful when the global exact controllability fails. In conclusion, we develop some applications of the main results involving, for instance, star graphs.

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