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arxiv: 1509.01300 · v1 · pith:WLOJFYU5new · submitted 2015-09-03 · 🪐 quant-ph

Maximum privacy without coherence, zero-error

classification 🪐 quant-ph
keywords quantumzero-errorcapacitydifferencemaximumprivatearxivcapacities
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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 arXiv:1312.4989, 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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