Single-atom trapping in holographic 2D arrays of microtraps with   arbitrary geometries
  We demonstrate single-atom trapping in two-dimensional arrays of microtraps with arbitrary geometries. We generate the arrays using a Spatial Light Modulator (SLM), with which we imprint an appropriate phase pattern on an optical dipole trap beam prior to focusing. We trap single $^{87}{\rm Rb}$ atoms in the sites of arrays containing up to $\sim100$ microtraps separated by distances as small as $3\;\mu$m, with complex structures such as triangular, honeycomb or kagome lattices. Using a closed-loop optimization of the uniformity of the trap depths ensures that all trapping sites are equivalent. This versatile system opens appealing applications in quantum information processing and quantum simulation, e.g. for simulating frustrated quantum magnetism using Rydberg atoms. 
Florence Nogrette, Henning Labuhn, Sylvain Ravets, Daniel Barredo,   Lucas B\'eguin, Aline Vernier, Thierry Lahaye, Antoine ...
physics.atom-ph cond-mat.quant-gas quant-ph