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Proceedings Paper

Optimal alphabets for noise-resistant quantum cryptography
Author(s): Denis V. Sych; Boris A. Grishanin; Victor N. Zadkov
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Paper Abstract

Possibilities of improving critical error rate of quantum key distribution (QKD) protocols for different strategies of eavesdropping are investigated. QKD-protocols with discrete alphabets letters of which form regular polyhedrons on the Bloch sphere (tetrahedron octahedron cube icosahedron and dodecahedron which have 4, 6, 8, 12 and 20 vertexes respectively) and QKD-protocol with continuous alphabet which corresponds to the limiting case of a polyhedron with infinitive number of vortexes are considered. Stability of such QKD-protocols to the noise in a quantum channel which is due to the Eve's interference that apply either intercept-receipt or optimal eavesdropping strategy at the individual attacks is studied in detail. It is shown that in case of optimal eavesdropping strategy after bases reconciliation the QKD-protocol with continuous alphabet surpasses all other protocols in terms of noise-resistance. Without basis reconciliation the highest critical error rate have the protocol with tetrahedron-type alphabet.

Paper Details

Date Published: 1 June 2005
PDF: 10 pages
Proc. SPIE 5833, Quantum Informatics 2004, (1 June 2005); doi: 10.1117/12.620519
Show Author Affiliations
Denis V. Sych, M.V. Lomonosov Moscow State Univ. (Russia)
Boris A. Grishanin, M.V. Lomonosov Moscow State Univ. (Russia)
Victor N. Zadkov, M.V. Lomonosov Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 5833:
Quantum Informatics 2004
Yuri I. Ozhigov, Editor(s)

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