Arita, Y.Bruce, G.D.Wright, E.M.Simpson, S.H.Zemanek, P.Dholakia, K.2022-11-172022-11-172022Optica, 2022; 9(9):1000-10022334-25362334-2536https://hdl.handle.net/2440/136902We demonstrate all-optical sympathetic cooling of a laser-trapped microsphere to sub-Kelvin temperatures, mediated by optical binding to a feedback-cooled adjacent particle. Our study opens prospects for multi-particle quantum entanglement and sensing in levitated optomechanics.en©2022 Optica Publishing Group. Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.All-optica sub-Kelvin sympathetic cooling of a levitated microsphere in vacuumJournal article10.1364/OPTICA.4663372022-11-17626686Dholakia, K. [0000-0001-6534-9009]