On Weyl-covariant channels

Details On Weyl-covariant channels On Weyl-covariant channels

2005-10-19

arxiv.org/abs/quant-ph/0510148v3

Physics

Quantum Physics

14 pages, 1 figure, some errors were corrected

Scientific paper

Formalism of discrete noncommutative Fourier transform is developed and applied to the study of Weyl-covariant channels. We then extend a result in quant-ph/0509126 concerning a bound of the maximal output 2-norm of a Weyl-covariant channel. A class of channels which attain the bound is introduced, for which the multiplicativity of the maximal output 2-norm is proven. Complementary channels are described which share the multiplicativity properties with the Weyl-covariant channels.

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