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  1. Is it correct that the following circuit can produce any two-qubit state with real amplitudes? (Meaning that for any set of the four real amplitudes there exists a set of angles...)

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  1. If so, should I generally expect that arbitrary state preparation algorithms (such as this one) can be adapted to preparing real-amplitude states by replacing all the single-qubit rotations with $R_y$'s?
mavzolej
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  • This paper might be helpful: https://arxiv.org/pdf/1903.01940.pdf Specifically see part 5 and 6 of Theorem 1. – KAJ226 Nov 02 '20 at 18:55
  • Thanks KAJ226. The recommended paper seems very interesting and truly can improve my understanding. – SuFong Chien May 30 '21 at 15:07

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