Single atom quantum walk with 1D optical superlattices
  A proposal for the implementation of quantum walks using cold atom technology is presented. It consists of one atom trapped in time varying optical superlattices. The required elements are presented in detail including the preparation procedure, the manipulation required for the quantum walk evolution and the final measurement. These procedures can be, in principle, implemented with present technology. 
Jaewoo Joo, P. L. Knight, and Jiannis K. Pachos