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arXiv · 2109.08444

Optimal orientation detection of an anisotropic dipolar scatterer

Felix Tebbenjohanns·Andrei Militaru·Andreas Norrman·Fons van der Laan·Lukas Novotny·Martin Frimmer
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Abstract

The angular orientation of an anisotropic scatterer with cylindrical symmetry in a linearly polarized light field represents an optomechanical librator. Here, we propose and theoretically analyze an optimal measurement scheme for the two angular degrees of freedom of such a librator. The imprecision-backaction product of this scheme reaches the Heisenberg uncertainty limit. Furthermore, we propose and analyze a realistic measurement scheme and show that, in the absence of spinning motion around the symmetry axis, measurement-based ground-state cooling of the rotational degrees of freedom of an anisotropic point scatterer levitated in an optical trap is feasible.

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Felix Tebbenjohanns, Andrei Militaru, Andreas Norrman, Fons van der Laan, Lukas Novotny, Martin Frimmer. 2021-09-17. Optimal orientation detection of an anisotropic dipolar scatterer. https://doi.org/10.1103/physreva.105.053504

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