par Durt, T.;Cerf, Nicolas 
;Gisin, Nicolas;Zukowski, Marek
Référence Physical review. A, Atomic, Molecular, and Optical Physics, 67, page (012311)
Publication Publié, 2003
;Gisin, Nicolas;Zukowski, MarekRéférence Physical review. A, Atomic, Molecular, and Optical Physics, 67, page (012311)
Publication Publié, 2003
Article révisé par les pairs
| Résumé : | The study of quantum cryptography and quantum entanglement have traditionally been based on two-level quantum systems (qubits). In this paper, we consider a generalization of Ekert’s entanglement-based quantum cryptographic protocol where qubits are replaced by three-level systems (qutrits). In order to investigate the security against the optimal individual attack, we derive the information gained by a potential eavesdropper applying a cloning-based attack. We exhibit the explicit form of this cloner, which is distinct from the previously known cloners, and conclude that the protocol is more robust than those based on entangled qubits as well as unentangled qutrits. © 2003 The American Physical Society. |
