Optical tweezers are also used to trap laser-cooled atoms in vacuum, mainly for applications in quantum science. Some achievements in this area include trapping of a single atom in 2001, trapping of 2D arrays of atoms in 2002, trapping of strongly interacting entangled pairs in 2010, trapping precisely assembled 2-dimensional arrays of atoms in 2016 and 3-dimensional arrays in 2018. These techniques have been used in quantum simulators to obtain programmable arrays of 196 and 256 atoms in 2021 and represent a promising platform for quantum computing.