Subadditivity of the minimum output entropy and superactivation of the classical capacity of quantum multiple access channels

Details Subadditivity of the minimum output entropy and superactivation of the classical capacity of quantum multiple access channels Subadditivity of the minimum output entropy and superactivation of the classical capacity of quantum multiple access channels

2010-12-31

arxiv.org/abs/1101.0264v2

Phys. Rev. A 83, 042304 (2011)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.83.042304

We study subadditivity of the minimum output entropy ($H_{min}$) of quantum multiple access channels (MACs). We provide an example of violation of the additivity theorem for $H_{min}$ known in classical information theory. Our result is based on a fundamental property of $MACs$ i.e. independence of each sender. The channels used in the example can be constructed explicitly. On the basis of subadditivity of $H_{min}$ we also provide an example of extremal superadditivity (super activation) of the classical capacity region of MACs.

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