Quantum Cryptography: Security Criteria Reexamined

Details Quantum Cryptography: Security Criteria Reexamined Quantum Cryptography: Security Criteria Reexamined

2003-10-23

arxiv.org/abs/quant-ph/0310144v2

Physical Review A, vol. 70, art. 032306 (5 pages) (2004)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevA.70.032306

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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