Two-dimensional quantum motion of a levitated nanosphere
- URL: http://arxiv.org/abs/2112.11383v1
- Date: Tue, 21 Dec 2021 17:39:49 GMT
- Title: Two-dimensional quantum motion of a levitated nanosphere
- Authors: A. Ranfagni, K. B{\o}rkje, F. Marino, and F. Marin
- Abstract summary: We report on the two-dimensional (2D) dynamics of a levitated nanoparticles in an optical cavity.
By rotating the polarization angle of the tweezer beam we tune the system from a one-dimensional (1D) cooling regime.
We achieve a strong 2D confinement with thermal occupancy of 3.4 $pm$ 0.4 along the warmest direction and around unity in the one.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We report on the two-dimensional (2D) dynamics of a levitated nanoparticle in
an optical cavity. The motion of the nanosphere is strongly coupled to the
cavity field by coherent scattering and heavily cooled in the plane orthogonal
to the tweezer axis. Due to the characteristics of the 2D motion and the strong
optomechanical coupling, the motional sideband asymmetry that reveals the
quantum nature of the dynamics is not limited to mere scale factors between
Stokes and anti-Stokes peaks, as customary in quantum optomechanics, but
assumes a peculiar spectral dependence. We introduce and discuss an effective
thermal occupancy that quantifies how close the system is to a minimum
uncertainty state and allows us to consistently characterize the particle
motion. By rotating the polarization angle of the tweezer beam we tune the
system from a one-dimensional (1D) cooling regime, where we achieve a best
thermal occupancy of 0.51 $\pm$ 0.05, to a regime in which the fully 2D
dynamics of the particle exhibits strong non-classical properties. We achieve a
strong 2D confinement with thermal occupancy of 3.4 $\pm$ 0.4 along the warmest
direction and around unity in the orthogonal one. These results represents a
major improvement with respect to previous experiments both considering the 1D
and 2D motion, and pave the way towards the preparation of tripartite
optomechanical entangled states and novel applications to directional force and
displacement quantum sensing.
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