Experimental Realization of Deutsch's Algorithm in a One-way Quantum   Computer
  We report the first experimental demonstration of an all-optical one-way implementation of Deutsch's quantum algorithm on a four-qubit cluster state. All the possible configurations of a balanced or constant function acting on a two-qubit register are realized within the measurement-based model for quantum computation. The experimental results are in excellent agreement with the theoretical model, therefore demonstrating the successful performance of the algorithm. 
M. S. Tame, R. Prevedel, M. Paternostro, P. B\"ohi, M. S. Kim and A.   Zeilinger