Long-distance continuous-variable quantum key distribution with a Gaussian modulation

被引：226
作者：
Jouguet, Paul [1 ,2 ]
Kunz-Jacques, Sebastien [2 ]
Leverrier, Anthony [3 ]
机构：
[1] Telecom ParisTech, CNRS LTCI, Inst Telecom, F-75634 Paris 13, France
[2] SeQureNet, F-75013 Paris, France
[3] ICFO Inst Ciencies Foton, E-08860 Castelldefels, Barcelona, Spain
来源：
PHYSICAL REVIEW A | 2011年 / 84卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.84.062317
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We designed high-efficiency error correcting codes allowing us to extract an errorless secret key in a continuous-variable quantum key distribution (CVQKD) protocol using a Gaussian modulation of coherent states and a homodyne detection. These codes are available for a wide range of signal-to-noise ratios on an additive white Gaussian noise channel with a binary modulation and can be combined with a multidimensional reconciliation method proven secure against arbitrary collective attacks. This improved reconciliation procedure considerably extends the secure range of a CVQKD with a Gaussian modulation, giving a secret key rate of about 10(-3) bit per pulse at a distance of 120 km for reasonable physical parameters.
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页数：7
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