Exact controllability to the ground state solution for evolution equations of parabolic type via bilinear control

In a separable Hilbert space $X$, we study the linear evolution equation \begin{equation*} u’(t)+Au(t)+p(t)Bu(t)=0, \end{equation*} where $A$ is an accretive self-adjoint linear operator, $B$ is a bounded linear operator on $X$, and $p\in L_{loc}^2(0,+\mathrm{\infty })$ is a bilinear control. We give sufficient conditions in order for the above control system to be locally controllable to the ground state solution, that is, the solution of the free equation ($p\equiv 0$) starting from the ground state of $A$. We also derive global controllability results in large time and discuss applications to parabolic equations in low space dimension.