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Optimal position detection of a dipolar scatterer in a focused field

Felix Tebbenjohanns, Martin Frimmer, and Lukas Novotny
Phys. Rev. A 100, 043821 – Published 14 October 2019

Abstract

We theoretically analyze the problem of detecting the position of a classical dipolar scatterer in a strongly focused optical field. We suggest an optimal measurement scheme and show that it resolves the scatterer's position in three dimensions at the Heisenberg limit of the imprecision-backaction product. We apply our formalism to levitated-optomechanics experiments and show that backscattering detection provides sufficient information to feedback cool the particle's motion along the optical axis to a phonon occupancy below unity under realistic experimental conditions.

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  • Received 30 July 2019

DOI:https://doi.org/10.1103/PhysRevA.100.043821

©2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Felix Tebbenjohanns*, Martin Frimmer, and Lukas Novotny

  • Photonics Laboratory, ETH Zürich, CH-8093 Zürich, Switzerland

  • *http://www.photonics.ethz.ch

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Issue

Vol. 100, Iss. 4 — October 2019

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