Quantum cryptography, eavesdropping and unsharp spin measurement

Authors
Roy, S Kar, G
Citation
S. Roy et G. Kar, Quantum cryptography, eavesdropping and unsharp spin measurement, CHAOS SOL F, 10(10), 1999, pp. 1715-1718
Citations number
11
Categorie Soggetti
Multidisciplinary
Journal title
CHAOS SOLITONS & FRACTALS
ISSN journal
09600779 → ACNP
Volume
10
Issue
10
Year of publication
1999
Pages
1715 - 1718
Database
ISI
SICI code
0960-0779(199910)10:10<1715:QCEAUS>2.0.ZU;2-J
Abstract
The various eavesdropping strategies on a quantum cryptographic channel as discussed by Gisin and and Huttner, Phys. Lett. A, Vol. 228, p. 13, 1997, c an be reproduced by unsharp spin (represented by positive operator valued m easure) measurement of spin-1/2 particle. An upper bound for unsharp parame ter is obtained so that it still gives rise to violation of Bell's inequali ty for the two particle transmission channel. (C) 1999 Elsevier Science Ltd . All rights reserved.