Subadditivity of the minimum output entropy and superactivation of the classical capacity of quantum multiple access channels
Journal Article
·
· Physical Review. A
- Faculty of Applied Physics and Mathematics, Gdansk University of Technology, 80-952 Gdansk (Poland) and National Quantum Information Center of Gdansk, 81-824 Sopot (Poland)
We study subadditivity of the minimum output entropy (H{sub min}) of quantum multiple access channels (MACs). We provide an example of violation of the additivity theorem for H{sub 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{sub min} we also provide an example of extremal superadditivity (superactivation) of the classical capacity region of MACs.
- OSTI ID:
- 21544572
- Journal Information:
- Physical Review. A, Vol. 83, Issue 4; Other Information: DOI: 10.1103/PhysRevA.83.042304; (c) 2011 American Institute of Physics; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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