Experimental investigations of the dipolar interactions between single   Rydberg atoms
  This review summarizes experimental works performed over the last decade by several groups on the manipulation of a few individual interacting Rydberg atoms. These studies establish arrays of single Rydberg atoms as a promising platform for quantum state engineering, with potential applications to quantum metrology, quantum simulation and quantum information. 
Antoine Browaeys, Daniel Barredo, and Thierry Lahaye
quant-ph physics.atom-ph