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An application of decomposable maps in proving multiplicativity of low dimensional maps

In this paper we present a class of maps for which the multiplicativity of the maximal output p-norm holds when p is 2 and p is larger than or equal to 4. The class includes all positive trace-preserving maps from the matrix algebra on the three-dimensional space to that on the two-dimensional.

preprint2009arXivOpen access
Motohisa Fukuda
quant-ph
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Motohisa Fukuda

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