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Classical capacities of compound and averaged quantum channels

 
: Bjelakovic, I.; Boche, H.

:

IEEE transactions on information theory 55 (2009), No.7, pp.3360-3374
ISSN: 0018-9448
English
Journal Article
Fraunhofer HHI ()
channel capacity; channel coding; entropy code; memoryless system; quantum communication

Abstract
We determine the capacity of compound classical-quantum channels. As a consequence, we obtain the capacity formula for the averaged classical-quantum channels. The capacity result for compound channels demonstrates, as in the classical setting, the existence of reliable universal classical-quantum codes in scenarios where the only apriori information about the channel used for the transmission of information is that it belongs to a given set of memoryless classical-quantum channels. Our approach is based on a universal classical approximation of the quantum relative entropy which in turn relies on a universal hypothesis testing result.

: http://publica.fraunhofer.de/documents/N-101939.html