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 squareroot measurement.
|Title of host publication
|Subtitle of host publication
|Festschrift in Honor of Berge Englert on his 60th Birthday
|World Scientific Publishing Co.
|Number of pages
|Published - 2015 Jan 1
All Science Journal Classification (ASJC) codes
- General Arts and Humanities
- General Physics and Astronomy