Position measurement of a levitated nanoparticle via interference with its mirror image
arXiv:2112.14990 · doi:10.1103/PhysRevLett.129.013601
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 , 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.
arXiv comment12 pages, 8 figures
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- The physics and applications of strongly coupled plasmas levitated in electrodynamic traps
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