Journal
COMMUNICATIONS IN MATHEMATICAL PHYSICS
Volume 331, Issue 2, Pages 593-622Publisher
SPRINGER
DOI: 10.1007/s00220-014-2122-x
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Funding
- European Commission (STREP QCS)
- European Research Council (Advanced Grant IRQUAT)
- Philip Leverhulme Trust
- ERC (Advanced Grant IRQUAT)
- NSFC [11375165]
- ICREA Funding Source: Custom
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A strong converse theorem for the classical capacity of a quantum channel states that the probability of correctly decoding a classical message converges exponentially fast to zero in the limit of many channel uses if the rate of communication exceeds the classical capacity of the channel. Along with a corresponding achievability statement for rates below the capacity, such a strong converse theorem enhances our understanding of the capacity as a very sharp dividing line between achievable and unachievable rates of communication. Here, we show that such a strong converse theorem holds for the classical capacity of all entanglement-breaking channels and all Hadamard channels (the complementary channels of the former). These results follow by bounding the success probability in terms of a sandwiched R,nyi relative entropy, by showing that this quantity is subadditive for all entanglement-breaking and Hadamard channels, and by relating this quantity to the Holevo capacity. Prior results regarding strong converse theorems for particular covariant channels emerge as a special case of our results.
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