Approximate controllability in small times of bilinear Schr{ö}dinger equations with magnetic drift

Abstract

We study the small-time approximate controllability of bilinear Schr{ö}dinger equations, where the drift is a magnetic Schr{ö}dinger operator and the control is an electric potential. We prove this property in two circumstances: (i) in ${\mathbb{R}}^d$, with a quadratic and an additional generic bounded electric potential in the control, and with a uniform magnetic field in the drift; (ii) in ${\mathbb{R}}^d$ or ${\mathbb{T}}^d$, with control electric potentials supported on a finite number of Hermite or Fourier eigenfunctions, and with any differentiable magnetic potential in the drift.