Position measurement of a levitated nanoparticle via interference with its mirror image

• URL: http://arxiv.org/abs/2112.14990v1
• Date: Thu, 30 Dec 2021 09:55:24 GMT
• Title: Position measurement of a levitated nanoparticle via interference with its mirror image
• Authors: Lorenzo Dania, Katharina Heidegger, Dmitry S. Bykov, Giovanni Cerchiari, Gabriel Araneda, Tracy E. Northup
• Abstract summary: We demonstrate a self-interference method to detect the particle's motion. We measure the particle's motion with a sensitivity of $1.7times 10-12 textm/sqrttextHz$, corresponding to a detection efficiency of 2.1%. As an application of this method, we cool the particle, via feedback, to temperatures below those achieved in the same setup using a standard position measurement.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Interferometric methods for detecting the motion of a levitated nanoparticle provide a route to the quantum ground state, but such methods are currently limited by mode mismatch between the reference beam and the dipolar field scattered by the particle. Here we demonstrate a self-interference method to detect the particle's motion that solves this problem. A Paul trap confines a charged dielectric nanoparticle in high vacuum, and a mirror retro-reflects the scattered light. We measure the particle's motion with a sensitivity of $1.7\times 10^{-12} \text{m}/\sqrt{\text{Hz}}$, corresponding to a detection efficiency of 2.1%, with a numerical aperture of 0.18. As an application of this method, we cool the particle, via feedback, to temperatures below those achieved in the same setup using a standard position measurement.

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