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

被引：233

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.

引用

页数：7

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