Physics – Quantum Physics
Scientific paper
2011-07-21
Phys. Rev. Lett. 108, 040501 (2012)
Physics
Quantum Physics
Corrected minor typos
Scientific paper
10.1103/PhysRevLett.108.040501
Superactivation is the property that two channels with zero quantum capacity can be used together to yield positive capacity. Here we demonstrate that this effect exists for a wide class of inequivalent channels, none of which can simulate each other. We also consider the case where one of two zero capacity channels are applied, but the sender is ignorant of which one is applied. We find examples where the greater the entropy of mixing of the channels, the greater the lower bound for the capacity. Finally, we show that the effect of superactivation is rather generic by providing example of superactivation using the depolarizing channel.
Brandao Fernando G. S. L.
Oppenheim Jonathan
Strelchuk Sergii
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