Multiplicativity properties of entrywise positive maps

Details Multiplicativity properties of entrywise positive maps Multiplicativity properties of entrywise positive maps

2004-09-26

arxiv.org/abs/quant-ph/0409181v2

Lin. Alg. Appl. 404, 367-379 (2005).

Physics

Quantum Physics

results extended to some infinite dimensional cases, including the Gaussian bosonic channel

Scientific paper

Multiplicativity of certain maximal p -> q norms of a tensor product of linear maps on matrix algebras is proved in situations in which the condition of complete positivity (CP) is either augmented by, or replaced by, the requirement that the entries of a matrix representative of the map are non-negative (EP). In particular, for integer t, multiplicativity holds for the maximal 2 -> 2t norm of a product of two maps, whenever one of the pair is EP; for the maximal 1 -> t norm for pairs of CP maps when one of them is also EP; and for the maximal 1 -> 2t norm for the product of an EP and a 2-positive map. Similar results are shown in the infinite-dimensional setting of convolution operators on L^2(R), with the pointwise positivity of an integral kernel replacing entrywise positivity of a matrix. These results apply in particular to Gaussian bosonic channels.

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