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

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

1999-04-21

arxiv.org/abs/quant-ph/9904077v1

Commun.Theor.Phys. 32 (1999) 335-338

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

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 in Grover's quantum search algorithm. The results also show that Grover's quantum search algorithm is robust.

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