This article is cited in 22 papers

Quantum optics and quantum computation

Analysis of limiting information characteristics of quantum-cryptography protocols

D. V. Sych^ab, B. A. Grishanin^ab, V. N. Zadkov<sup>ab

a</sup> Lomonosov Moscow State University, Faculty of Physics
^b International Laser Center of Moscow State University

Abstract: The problem of increasing the critical error rate of quantum-cryptography protocols by varying a set of letters in a quantum alphabet for space of a fixed dimensionality is studied. Quantum alphabets forming regular polyhedra on the Bloch sphere and the continual alphabet equally including all the quantum states are considered. It is shown that, in the absence of basis reconciliation, a protocol with the tetrahedral alphabet has the highest critical error rate among the protocols considered, while after the basis reconciliation, a protocol with the continual alphabet possesses the highest critical error rate.

PACS: 03.67.Dd, 03.67.Pp

Received: 22.09.2004

 English version: Quantum Electronics, 2005, 35:1, 80–84

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