Resonance of Minimizers for $n$-level Quantum Systems with an Arbitrary Cost

Details Resonance of Minimizers for $n$-level Quantum Systems with an Arbitrary Cost Resonance of Minimizers for $n$-level Quantum Systems with an Arbitrary Cost

2003-08-20

arxiv.org/abs/quant-ph/0308103v2

Physics

Quantum Physics

The part about abnormal extremals is now given in a weaker form, following a remark of an anonymous referee

Scientific paper

We consider an optimal control problem describing a laser-induced population transfer on a $n$-level quantum system. For a convex cost depending only on the moduli of controls (i.e. the lasers intensities), we prove that there always exists a minimizer in resonance. This permits to justify some strategies used in experimental physics. It is also quite important because it permits to reduce remarkably the complexity of the problem (and extend some of our previous results for $n=2$ and $n=3$): instead of looking for minimizers on the sphere $S^{2n-1}\subset\C^n$ one is reduced to look just for minimizers on the sphere $S^{n-1}\subset \R^n$. Moreover, for the reduced problem, we investigate on the question of existence of strict abnormal minimizer.

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