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Direct and Reverse Secret-Key Capacities of a Quantum Channel

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JournalPhysical Review Letters
DatePublished - 6 Feb 2009
Issue number5
Number of pages4
Original languageEnglish


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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