期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.050503
关键词
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资金
- Marie Curie Action within the 6th European Community Framework Programme
- W.M. Keck foundation center for extreme quantum information theory (xQIT)
- Engineering and Physical Sciences Research Council [EP/F005881/1] Funding Source: researchfish
- EPSRC [EP/F005881/1] Funding Source: UKRI
We define the direct and reverse secret-key capacities of a memoryless quantum channel as the optimal rates that entanglement-based quantum-key-distribution protocols can reach by using a single forward classical communication (direct reconciliation) or a single feedback classical communication (reverse reconciliation). In particular, the reverse secret-key capacity can be positive for antidegradable channels, where no forward strategy is known to be secure. This property is explicitly shown in the continuous variable framework by considering arbitrary one-mode Gaussian channels.
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