We remark that Deutsch-Jozsa algorithm has confused two unitary transformations: one is performed on a pure state, the other is performed on a superposition. In the past decades, no constructive specifications on the essential unitary operator performed on the superposition have been found. We think the Deutsch-Jozsa algorithm needs more constructive specifications so as to check its correctness.
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[v1] 2018-01-21 13:58:08
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