Physics – Mathematical Physics
Scientific paper
2008-02-17
J. Infin. Dim. Anal. Quantum Probability and Related Topics 12(2009), 99-116.
Physics
Mathematical Physics
19 pages
Scientific paper
10.1088/1742-6596/143/1/012011
The history of complementary observables and mutual unbiased bases is
reviewed. A characterization is given in terms of conditional entropy of
subalgebras. The concept of complementarity is extended to non-commutative
subalgebras. Complementary decompositions of a 4-level quantum system are
described and a characterization of the Bell basis is obtained.
Petz Denes
Szanto Agnes
Weiner Mihály
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