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2008

Can non-private channels transmit quantum information?

Smith, Graeme, Smolin, John

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We study the power of quantum channels with little or no capacity for private communication.

Because privacy is a necessary condition for quantum communication, one might expect that such channels would be of little use for transmitting quantum states.
Nevertheless, we find strong evidence that there are pairs of such channels that, when used together, can transmit far more quantum information than the sum of their individual private capacities.
Because quantum transmissions are necessarily private, this would imply a large violation of additivity for the private capacity.

Can non-private channels transmit quantum information? · Around

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Then

I. Devetak, IEEE Trans. Inf. Theory 51
2005
Later among the works it cites.
C. H. Bennett, I. Devetak, P. W. Shor, and J. A. Smolin, Phys. Rev. Lett. 96
2006
Later among the works it cites.
G. Smith, J. Renes, and J. A. Smolin, Phys. Rev. Lett. 100
2008
Closest in time.
G. Smith and J. Yard, Science Magazine (2008), arXiv:0807.4935
Original
2008
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K. Horodecki, L. Pankowski, M. Horodecki, and P. Horodecki, IEEE Trans. Info. Theory 54
2008
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