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# Arbitrary phase rotation of the marked state can not be used for Grover's quantum search algorithm

Communications in Theoretical Physics, no. 3 (1999): 335-338

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A misunderstanding that an arbitrary phase rotation of the marked state together with the inversion about average operation in Grover's search algorithm can be used to construct a (less efficient) quantum search algorithm is cleared. The $\pi$ rotation of the phase of the marked state is not only the choice for efficiency, but also vital ...More

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Wei Lin Zhang