Title
Coherent-scattering two-dimensional cooling in levitated cavity optomechanics
Author
Marko Toroš
Department of Physics and Astronomy, University College London
Author
Fagin Hales
Department of Physics and Astronomy, University College London
... show all
Abstract
The strong light-matter optomechanical coupling offered by coherent scattering set-ups have allowed the experimental realization of quantum ground-state cavity cooling of the axial motion of a levitated nanoparticle [U. Delić et al., Science 367, 892 (2020)]. An appealing milestone is now quantum two-dimensional (2D) cooling of the full in-plane motion, in any direction in the transverse plane. By a simple adjustment of the trap polarization, one obtains two nearly equivalent modes, with similar frequencies ωx∼ωy and optomechanical couplings gx≃gy—in this experimental configuration we identify an optimal trap ellipticity, nanosphere size, and cavity linewidth which allows for efficient 2D cooling. Moreover, we find that 2D cooling to occupancies nx+ny≲1 at moderate vacuum (10−6 mbar) is possible in a “Goldilocks” zone bounded by √κΓ/4≲gx,gy≲∣∣ωx−ωy∣∣≲κ, where one balances the need to suppress dark modes while avoiding far-detuning of either mode or low cooperativities, and κ (Γ) is the cavity decay rate (motional heating rate). With strong-coupling regimes gx,gy≳κ in view one must consider the genuine three-way hybridization between x,y and the cavity light mode resulting in hybridized bright/dark modes. Finally, we show that bright/dark modes in the levitated set-up have a simple geometrical interpretation, related by rotations in the transverse plane, with implications for directional sensing.
Keywords
General Earth and Planetary SciencesGeneral Environmental Science
Object type
Language
English [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:1621433
Appeared in
Title
Physical Review Research
Volume
3
Issue
2
ISSN
2643-1564
Issued
2021
Publisher
American Physical Society (APS)
Date issued
2021
Access rights
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