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9 September 2019 Manipulating a charged nanoparticle in a Paul trap for ion-assisted levitated optomechanics
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Abstract
The field of levitated optomechanics studies the interaction between light and the mechanical motion of mesoscopic objects that are suspended by means of magnetic, optical, or electrodynamic traps. The lack of a clamping structure drastically reduces mechanical and thermal coupling with the environment, making these physical systems particularly suitable as ultrasensitive force detectors and as a test bench for quantum mechanics in new regimes. In our experiment, we use a Paul trap to levitate a charged glass sphere that is 300 nm in diameter. We use an ultra-high-vacuum compatible technique to load a nanosphere into the trap. Furthermore, we have developed a method to control the electric charge of the trapped particle, which allows us to tune its oscillation frequency as well as to measure its mass precisely. Here we also report on the observation of cooling of the particle’s secular motion by means of feedback cooling, reaching a few tens of mK starting from room temperature. In future work, in order to reach quantum regimes, we plan to couple the center-of-mass motion of the nanoparticle and a single Ca+ ion to an optical cavity. Such a system offers new opportunities for levitated optomechanics, including new cooling schemes in the unresolved sideband regime and protocols for nonclassical motional state preparation.
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Lorenzo Dania, Dmitry Bykov, Pau Mestres, and Tracy E. Northup "Manipulating a charged nanoparticle in a Paul trap for ion-assisted levitated optomechanics", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 1108335 (9 September 2019); https://doi.org/10.1117/12.2529127
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