2023/07/28 by Alessandro Duca, Duca, Alessandro, Eugenio Pozzoli +1 · 1 citation
Mathematics · Physics and Astronomy · #35Q55 #81Q93 #93B05 #Advanced Mathematical Physics Problems #Analysis of PDEs (math.AP) #FOS: Mathematics #FOS: Physical sciences #Numerical methods for differential equations #Optimization and Control (math.OC) #Quantum Mechanics and Non-Hermitian Physics #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2307.15819
openalex publication_date 2023/07/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We address the small-time controllability problem for a nonlinear Schrödinger equation (NLS) on ℝN in the presence of magnetic and electric external fields. We choose a particular framework where the equation becomes i∂t ψ= [-Δ+u0(t)h_0+⟨ u(t), P⟩ +κ|ψ|2p]ψ. Here, the control operators are defined by the zeroth Hermite function h_0(x) and the momentum operator P=i∇. In detail, we study when it is possible to control the dynamics of (NLS) as fast as desired via sufficiently large control signals u0 and u. We first show the existence of a family of quantum states for which this property is verified. Secondly, by considering some specific states belonging to this family, as a physical consequence we show the capability of controlling arbitrary changes of energy in bounded regions of the quantum system, in time zero. Our results are proved by exploiting the idea that the nonlinear term in (NLS) is only a perturbation of the linear problem when the time is as small as desired. The core of the proof, then, is the controllability of the bilinear equation which is tackled by using specific non-commutativity properties of infinite-dimensional propagators.