Experimental NMR Realization of A Generalized Quantum Search Algorithm
  A generalized quantum search algorithm, where phase inversions for the marked state and the prepared state are replaced by $\pi/2$ phase rotations, is realized in a 2-qubit NMR heteronuclear system. The quantum algorithm searches a marked state with a smaller step compared to standard Grover algorithm. Phase matching requirement in quantum searching is demonstrated by comparing it with another generalized algorithm where the two phase rotations are $\pi/2$ and $3\pi/2$ respectively. Pulse sequences which include non 90 degree pulses are given. 
G. L. Long, H. Y. Yan, Y. S. Li, C. C. Tu, J. X. Tao, H.M. Chen, M. L.   Liu, X. Zhang, J. Luo, L. Xiao, X. Z. Zeng