@article{U2020, author = {U. Delić, and M. Reisenbauer, and K. Dare, and D. Grass, and V. Vuletić, and N. Kiesel, and M. Aspelmeyer,}, year = {2020}, pages = {892-895}, title = {Cooling of a levitated nanoparticle to the motional quantum ground state}, volume = {367}, journal = {Science} }