Physics – Mathematical Physics
Scientific paper
2009-07-23
Quantum Info. & Comp. Vol 10, pages 0803-0820, 2010
Physics
Mathematical Physics
As the published version with minor changes
Scientific paper
All complex Hadamard matrices in dimensions two to five are known. We use this fact to derive all inequivalent sets of mutually unbiased (MU) bases in low dimensions. We find a three-parameter family of triples of MU bases in dimension four and two inequivalent classes of MU triples in dimension five. We confirm that the complete sets of (d+1) MU bases are unique (up to equivalence) in dimensions below six, using only elementary arguments for d less than five.
Bengtsson Ingemar
Brierley Stephen
Weigert Stefan
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