Abstract We collect some recent results that together provide an almost complete answer to the question stated in the title. For the dimension d = 2 the answer is three. For the dimensions d = 3 and d ≥ 5 the answer is four. For the dimension d = 4 the answer is either three or four. Curiously, the exact number in d = 4 seems to be an open problem.
CITATION STYLE
Carmeli, C., Heinosaari, T., Schultz, J., & Toigo, A. (2015). How many orthonormal bases are needed to distinguish all pure quantum states? European Physical Journal D, 69(7). https://doi.org/10.1140/epjd/e2015-60230-5
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