Secure quantum key distribution using continuous variables of single photons

被引:77
作者
Zhang, Lijian [1 ]
Silberhorn, Christine [2 ]
Walmsley, Ian A. [1 ]
机构
[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England
[2] Univ Erlangen Nurnberg, Inst Opt Informat & Photon, D-91058 Erlangen, Germany
关键词
D O I
10.1103/PhysRevLett.100.110504
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We analyze the distribution of secure keys using quantum cryptography based on the continuous variable degree of freedom of entangled photon pairs. We derive the information capacity of a scheme based on the spatial entanglement of photons from a realistic source, and show that the standard measures of security known for quadrature-based continuous variable quantum cryptography (CV-QKD) are inadequate. A specific simple eavesdropping attack is analyzed to illuminate how secret information may be distilled well beyond the bounds of the usual CV-QKD measures.
引用
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页数:4
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