We present an efficient procedure to filter out from an optical lattice, having inhomogeneous site occupation number, only preselected number of bosonic atoms per site and place them into another internal atomic state, creating thereby a lattice with desired site occupation number.
@article{arxiv.1003.4443,
title = {Atom number filter in an optical lattice},
author = {Georgios M. Nikolopoulos and David Petrosyan},
journal= {arXiv preprint arXiv:1003.4443},
year = {2015}
}