Calculating a maximizer for quantum mutual information

Details Calculating a maximizer for quantum mutual information Calculating a maximizer for quantum mutual information

2011-07-19

arxiv.org/abs/1107.3741v1

International Journal of Quantum Information, vol. 6, pages 745-750, 2008

Physics

Quantum Physics

Published in IJQI (2008). One figure added

Scientific paper

We obtain a maximizer for the quantum mutual information for classical information sent over the quantum qubit amplitude damping channel. This is achieved by limiting the ensemble of input states to antipodal states, in the calculation of the product-state capacity for the channel, the resulting maximizing ensemble consisting of just two non-orthogonal states. We also consider the product-state capacity of a convex combination of two memoryless channels and demonstrate in particular that it is in general not given by the minimum of the capacities of the respective memoryless channels.

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