Maximum privacy without coherence, zero-error

Publication Type:
Journal Article
Journal of Mathematical Physics, 2016, 57 (9)
Issue Date:
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We study the possible difference between the quantum and the private capacities of a quantum channel in the zero-error setting. For a family of channels introduced by Leung et al. [Phys. Rev. Lett. 113, 030512 (2014)], we demonstrate an extreme difference: the zero-error quantum capacity is zero, whereas the zero-error private capacity is maximum given the quantum output dimension.
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