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American Physical Society, Physical Review A, 3(70), 2004

DOI: 10.1103/physreva.70.032306

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Quantum Cryptography: Security Criteria Reexamined

Journal article published in 2003 by Dagomir Kaszlikowski, Ajay Gopinathan, Yeong Cherng Liang ORCID, L. C. Kwek, Berthold-Georg Englert
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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. Comment: 4 pages, 4 figures. No substantial changes. Updated version as published in PRA