



@article {1457,
	title = {Entanglement can completely defeat quantum noise},
	journal = {Physical Review Letters},
	volume = {107},
	year = {2011},
	month = {2011/12/15},
	abstract = {  We describe two quantum channels that individually cannot send any
information, even classical, without some chance of decoding error. But
together a single use of each channel can send quantum information perfectly
reliably. This proves that the zero-error classical capacity exhibits
superactivation, the extreme form of the superadditivity phenomenon in which
entangled inputs allow communication over zero capacity channels. But our
result is stronger still, as it even allows zero-error quantum communication
when the two channels are combined. Thus our result shows a new remarkable way
in which entanglement across two systems can be used to resist noise, in this
case perfectly. We also show a new form of superactivation by entanglement
shared between sender and receiver.
},
	doi = {10.1103/PhysRevLett.107.250504},
	url = {http://arxiv.org/abs/1109.0540v1},
	author = {Jianxin Chen and Toby S. Cubitt and Aram W. Harrow and Graeme Smith}
}
@article {1446,
	title = {Superactivation of the Asymptotic Zero-Error Classical Capacity of a  Quantum Channel},
	journal = {IEEE Transactions on Information Theory},
	volume = {57},
	year = {2011},
	month = {2011/12/01},
	pages = {8114 - 8126},
	abstract = {  The zero-error classical capacity of a quantum channel is the asymptotic rate
at which it can be used to send classical bits perfectly, so that they can be
decoded with zero probability of error. We show that there exist pairs of
quantum channels, neither of which individually have any zero-error capacity
whatsoever (even if arbitrarily many uses of the channels are available), but
such that access to even a single copy of both channels allows classical
information to be sent perfectly reliably. In other words, we prove that the
zero-error classical capacity can be superactivated. This result is the first
example of superactivation of a classical capacity of a quantum channel.
},
	doi = {10.1109/TIT.2011.2169109},
	url = {http://arxiv.org/abs/0906.2547v3},
	author = {Toby S. Cubitt and Jianxin Chen and Aram W. Harrow}
}
