High Efficient Secret Key Distillation for Long Distance Continuous Variable Quantum Key Distribution

Details High Efficient Secret Key Distillation for Long Distance Continuous Variable Quantum Key Distribution High Efficient Secret Key Distillation for Long Distance Continuous Variable Quantum Key Distribution

2006-03-08

arxiv.org/abs/quant-ph/0603068v3

Physics

Quantum Physics

4 pages 2 figures. Language revised, title revised, numerical simulation optimized

Scientific paper

The continuous variable quantum key distribution is expected to provide high secret key rate without single photon source and detector, but the lack of the secure and effective key distillation method makes it unpractical. Here, we present a secure single-bit-reverse-reconciliation protocol combined with secret information concentration and post-selection, which can distill the secret key with high efficiency and low computational complexity. The simulation results show that this protocol can provide high secret key rate even when the transmission fiber is longer than 150km, which may make the continuous variable scheme to outvie the single photon one.

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