How much complementarity? [PDF]
Ingemar BengtssonBohr placed complementary bases at the mathematical centre point of his viewView original: http://arxiv.org/abs/1202.3561
of quantum mechanics. On the technical side then my question translates into
that of classifying complex Hadamard matrices. Recent work (with Barros e Sa)
shows that the answer depends heavily on the prime number decomposition of the
Hilbert space. By implication so does the geometry of quantum state space.
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