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

Journal Article · Fri Apr 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.042304· OSTI ID:21544572

Czekaj, L ^[1]

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1. 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, Journal Name: Physical Review. A Journal Issue: 4 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAPACITY
ENTROPY
INFORMATION
INFORMATION THEORY
PHYSICAL PROPERTIES
QUANTUM INFORMATION
THERMODYNAMIC PROPERTIES