Quantum cryptography: Security criteria reexamined

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The generally accepted security criteria for a whole class of protocols for quantum cryptography was analyzed. It was shown that the security criteria are flawed. The reason of the flaw was 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. The results show that there are rather large parameter regimes in which the optimal measurement extracts substantially more information that the square-root measurement.

Original languageEnglish
Article number032306
Pages (from-to)032306-1-032306-5
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
Publication statusPublished - 2004 Sep

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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