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Unbounded number of channel uses may be required to detect quantum capacity
(NPGNature Communications, 2015-03-31)
Transmitting data reliably over noisy communication channels is one of the most important applications of information theory, and is well understood for channels modelled by classical physics. However, when quantum effects ...
Superadditivity of private information for any number of uses of the channel
(APSPhysical Review Letters, 2015-07-20)
The quantum capacity of a quantum channel is always smaller than the capacity of the channel for private communication. Both quantities are given by the infinite regularization of the coherent and the private information, ...