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Classical and quantum controllability of a rotating 3D symmetric molecule

Abstract : In this paper we study the controllability problem for a symmetric-top molecule, both for its classical and quantum rotational dynamics. As controlled fields we consider three orthogonally polarized electric fields which interact with the electric dipole of the molecule. We characterize the controllability in terms of the dipole position: when it lies along the symmetry axis of the molecule nor the classical neither the quantum dynamics are controllable, due to the presence of a conserved quantity, the third component of the total angular momentum; when it lies in the orthogonal plane to the symmetry axis, a quantum symmetry arises, due to the superposition of symmetric states, which as no classical counterpart. If the dipole is neither along the symmetry axis nor orthogonal to it, controllability for the classical dynamics and approximate controllability for the quantum dynamics is proved to hold. The controllability properties of the classical rotational dynamics are analyzed by applying geometric control theory techniques. To establish the approximate controllability of the symmetric-top Schrödinger equation we use a Lie-Galerkin method, based on block-wise approximations of the infinite dimensional systems.
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Contributor : Mario Sigalotti <>
Submitted on : Friday, December 20, 2019 - 3:32:18 PM
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Ugo Boscain, Eugenio Pozzoli, Mario Sigalotti. Classical and quantum controllability of a rotating 3D symmetric molecule. SIAM Journal on Control and Optimization, Society for Industrial and Applied Mathematics, 2020, 59 (1), ⟨10.1137/20M1311442⟩. ⟨hal-02421593⟩



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