# Entanglement can completely defeat quantum noise.

@article{Chen2011EntanglementCC, title={Entanglement can completely defeat quantum noise.}, author={J. Chen and T. Cubitt and A. Harrow and G. Smith}, journal={Physical review letters}, year={2011}, volume={107 25}, pages={ 250504 } }

We describe two quantum channels that individually cannot send any classical information 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… CONTINUE READING

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