Direct and Reverse Secret-Key Capacities of a Quantum Channel

TY - JOUR

T1 - Direct and Reverse Secret-Key Capacities of a Quantum Channel

AU - Pirandola, Stefano

AU - Garcia-Patron, Raul

AU - Braunstein, Samuel L.

AU - Lloyd, Seth

PY - 2009/2/6

Y1 - 2009/2/6

N2 - 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.

AB - 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.

KW - GAUSSIAN CHANNELS

KW - STATES

UR - http://www.scopus.com/inward/record.url?scp=60749135344&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.102.050503

DO - 10.1103/PhysRevLett.102.050503

M3 - Article

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 050503

ER -