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Controllablity of a quantum particle in a 1D variable domain

Published online by Cambridge University Press:  21 September 2007

Karine Beauchard
Karine Beauchard*
Affiliation:
CMLA, ENS Cachan, 61 avenue du président Wilson, 94235 Cachan cedex, France; [email protected]
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Abstract

We consider a quantum particle in a 1D infinite square potential well with variable length. It is a nonlinear control system in which the state is the wave function ϕ of the particle and the control is the length l(t) of the potential well. We prove the following controllability result : given $\phi_{0}$ close enough to an eigenstate corresponding to the length l = 1 and $\phi_{f}$ close enough to another eigenstate corresponding to the length l=1, there exists a continuous function $l:[0,T] \rightarrow \mathbb{R}^{*}_{+}$ with T > 0, such that l(0) = 1 and l(T) = 1, and which moves the wave function from $\phi_{0}$ to $\phi_{f}$ in time T.In particular, we can move the wave function from one eigenstate to another one by acting on the length of the potential well in a suitable way.Our proof relies on local controllability results proved with moment theory, a Nash-Moser implicit function theorem and expansions to the second order.

Keywords

ControllabilitySchrödinger equationNash-Moser theoremmoment theory
Type
Research Article
Information
ESAIM: Control, Optimisation and Calculus of Variations , Volume 14 , Issue 1 , January 2008 , pp. 105 - 147
Copyright
© EDP Sciences, SMAI, 2007

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