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arXiv quant-ph/03101442003-10quant-ph

Quantum Cryptography: Security Criteria Reexamined

Dagomir Kaszlikowski, Ajay Gopinathan, Yeong Cherng Liang, L. C. Kwek, Berthold-Georg Englert

备注：: 4 pages, 4 figures. No substantial changes. Updated version as published in PRA
发表信息：: Physical Review A, vol. 70, art. 032306 (5 pages) (2004)
DOI：: 10.1103/PhysRevA.70.032306

英文摘要：

We find that the generally accepted security criteria are flawed for a whole class of protocols for quantum cryptography. This is so because a standard assumption of the security analysis, namely that the so-called square-root measurement is optimal for eavesdropping purposes, is not true in general. There are rather large parameter regimes in which the optimal measurement extracts substantially more information than the square-root measurement.

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