OPTIMAL EAVESDROPPING ON NOISY STATES IN QUANTUM KEY DISTRIBUTION

被引：10

作者：

Shadman, Z. ^{[1
]}

Kampermann, H. ^{[1
]}

Meyer, T. ^{[1
]}

Bruss, D. ^{[1
]}

机构：

[1] Univ Dusseldorf, Inst Theoret Phys 3, D-40225 Dusseldorf, Germany

来源：

INTERNATIONAL JOURNAL OF QUANTUM INFORMATION | 2009年 / 7卷 / 01期

关键词：

Quantum key distribution; mixed states; white noise; eavesdropping; mutual information; CRYPTOGRAPHY; INFORMATION;

D O I：

10.1142/S0219749909004554

中图分类号：

TP301 [理论、方法];

学科分类号：

081202 ;

摘要：

We study eavesdropping in quantum key distribution with the six state protocol, when the signal states are mixed with white noise. This situation may arise either when Alice deliberately adds noise to the signal states before they leave her lab, or in a realistic scenario where Eve cannot replace the noisy quantum channel by a noiseless one. We find Eve's optimal mutual information with Alice, for individual attacks, as a function of the qubit error rate. Our result is that added quantum noise reduces Eve's mutual information more than Bob's.

引用

页码：297 / 306

页数：10

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