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A levitated nanomechanical oscillator under ultrahigh vacuum is highly isolated from its environment. It has been predicted that this isolation leads to very low mechanical dissipation rates. However, a gap persists between predictions and experimental data. Here, we levitate a silica nanoparticle in a linear Paul trap at room temperature, at pressures as low as 7×10−11 mbar. We measure a dissipation rate of 2π×69(22) nHz, corresponding to a quality factor exceeding 1010, more than 2 orders of magnitude higher than previously shown. A study of the pressure dependence of the particle's damping and heating rates provides insight into the relevant dissipation mechanisms.Received 27 July 2023Revised 27 January 2024Accepted 6 February 2024DOI:https://doi.org/10.1103/PhysRevLett.132.133602© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOptomechanicsPhysical SystemsMicromechanical & nanomechanical oscillatorsTechniquesCooling & trappingAtomic, Molecular & Optical
Dania et al. (2024) studied this question.