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When I was reading about quantum algorithms I faced the Deutsch-Jozsa algorithm, I see that if we want to solve that problem in a non-quantum algorithm, our algorithm would have exponential time complexity. Now I want to know what is the time complexity of Deutsch-Jozsa algorithm as a quantum algorithm on quantum computers?
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According to Wikipedia the complexity of the quantum algorithm is constant:
The Deutsch-Jozsa quantum algorithm produces an answer that is always correct with a single evaluation of f.
The algorithm itself are just some calculations on quantum states, without any iterations/... so complexity is O(1).
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