dorsal/arxiv
View SchemaMultiplicativity properties of entrywise positive maps
| Authors | Christopher King, Michael Nathanson, Mary Beth Ruskai |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0409181 |
| URL | https://arxiv.org/abs/quant-ph/0409181 |
| Journal | Lin. Alg. Appl. 404, 367-379 (2005). |
Abstract
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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"abstract": "Multiplicativity of certain maximal p -\u003e q norms of a tensor product of\nlinear maps on matrix algebras is proved in situations in which the condition\nof complete positivity (CP) is either augmented by, or replaced by, the\nrequirement that the entries of a matrix representative of the map are\nnon-negative (EP). In particular, for integer t, multiplicativity holds for the\nmaximal 2 -\u003e 2t norm of a product of two maps, whenever one of the pair is EP;\nfor the maximal 1 -\u003e t norm for pairs of CP maps when one of them is also EP;\nand for the maximal 1 -\u003e 2t norm for the product of an EP and a 2-positive map.\nSimilar results are shown in the infinite-dimensional setting of convolution\noperators on L^2(R), with the pointwise positivity of an integral kernel\nreplacing entrywise positivity of a matrix. These results apply in particular\nto Gaussian bosonic channels.",
"arxiv_id": "quant-ph/0409181",
"authors": [
"Christopher King",
"Michael Nathanson",
"Mary Beth Ruskai"
],
"categories": [
"quant-ph",
"math.OA"
],
"journal_ref": "Lin. Alg. Appl. 404, 367-379 (2005).",
"title": "Multiplicativity properties of entrywise positive maps",
"url": "https://arxiv.org/abs/quant-ph/0409181"
},
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