Direct and Reverse Secret-Key Capacities of a Quantum Channel
Author(s)
Braunstein, Samuel L.; Garcia-Patron Sanchez, Raul; Lloyd, Seth; Pirandola, Stefano
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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.
Date issued
2009-02Department
Massachusetts Institute of Technology. Department of Mechanical Engineering; Massachusetts Institute of Technology. Research Laboratory of ElectronicsJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Pirandola, Stefano et al. “Direct and Reverse Secret-Key Capacities of a Quantum Channel.” Physical Review Letters 102.5 (2009): 050503. (C) 2010 The American Physical Society.
Version: Final published version
ISSN
0031-9007