Security of quantum key distribution with entangled qutrits

Journal Article · Wed Jan 01 00:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.012311· OSTI ID:20634089

Durt, Thomas ^[1]; Cerf, Nicolas J ^[2]; Gisin, Nicolas ^[3]; Zukowski, Marek ^[4]

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1. Toegepaste Natuurkunde en Fotonica, Theoretische Natuurkunde, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels (Belgium)
2. Ecole Polytechnique, CP 165, Universite Libre de Bruxelles, 1050 Brussels (Belgium)
3. Group of Applied Physics-Optique, Universite de Geneve, 20 rue de l'Ecole de Medecine, Geneva 4 (Switzerland)
4. Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdanski, PL-80-952 Gdansk (Poland)

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.

• OSTI ID: 20634089
• Journal Information: Physical Review. A, Vol. 67, Issue 1; Other Information: DOI: 10.1103/PhysRevA.67.012311; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

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