Comments on quant-ph/0506137: Fast quantum search algorithms by qubit   comparisons exploiting global phase interference
  Recently, Andreas de Vries proposed a quantum algorithm that would find an element in an unsorted database exponentially faster than Grover's algorithm. We show that de Vries' algorithm does not work as intended and does not give any clue about the position of the searched element. 
L.A.B. Kowada, C.M.H. de Figueiredo, R. Portugal and C.C. Lavor