Wigner representation for experiments on quantum cryptography using two-photon polarization entanglement produced in parametric down-conversion

被引：13
|
作者：
Casado, A. [1 ]
Guerra, S. [2 ]
Placido, J. [3 ]
机构：
[1] Univ Seville, Dept Fis Aplicada 3, Escuela Super Ingn, Seville 41092, Spain
[2] Univ Nacl Educ Distancia, Ctr Asociado, Las Palmas Gran Canaria, Spain
[3] Univ Las Palmas Gran Canaria, Dept Fis, Las Palmas Gran Canaria, Spain
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2008年 / 41卷 / 04期
关键词：
D O I：
10.1088/0953-4075/41/4/045501
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, the theory of parametric down-conversion in the Wigner representation is applied to Ekert's quantum cryptography protocol. We analyse the relation between two-photon entanglement and (non-secure) quantum key distribution within the Wigner framework in the Heisenberg picture. Experiments using two-qubit polarization entanglement generated in nonlinear crystals are analysed in this formalism, along with the effects of eavesdropping attacks in the case of projective measurements.
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页数：7
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