Physics – Quantum Physics
Scientific paper
2009-07-16
Journal of Physics A Mathematical and Theoretical 42 (2009) 353001
Physics
Quantum Physics
Topical review (40 pages). Dedicated to the memory of Yurii Fedorovich Smirnov
Scientific paper
10.1088/1751-8113/42/35/353001
The construction of unitary operator bases in a finite-dimensional Hilbert space is reviewed through a nonstandard approach combinining angular momentum theory and representation theory of SU(2). A single formula for the bases is obtained from a polar decomposition of SU(2) and analysed in terms of cyclic groups, quadratic Fourier transforms, Hadamard matrices and generalized Gauss sums. Weyl pairs, generalized Pauli operators and their application to the unitary group and the Pauli group naturally arise in this approach.
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