New multiplicativity results for qubit maps

@inproceedings{King2006NewMR,
  title={New multiplicativity results for qubit maps},
  author={Christopher King and Nilufer Koldan},
  year={2006}
}
Let Φ be a trace-preserving, positivity-preserving linear map on the algebra of complex 2 × 2 matrices, and let Ω be any finite-dimensional completely positive map. For p = 2 and p ≥ 4, we prove that the maximal p-norm of the product map Φ ⊗ Ω is the product of the maximal p-norms of Φ and Ω. Restricting Φ to the class of completely positive maps, this settles the multiplicativity question for all qubit channels in the range of values p ≥ 4. 

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