A. P. Makkaveev, D. I. Pomozov, S. N. Molotkov, “Simple estimate of the critical length of a quantum communication channel with attenuation for coherent-state quantum cryptography”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2004, Volume 79, Issue 10,Pages <nobr>624

QUANTUM INFORMATION SCIENCE

Simple estimate of the critical length of a quantum communication channel with attenuation for coherent-state quantum cryptography

A. P. Makkaveev^a, D. I. Pomozov^a, S. N. Molotkov^ab

^a M. V. Lomonosov Moscow State University, Faculty of Computational Mathematics and Cybernetics
^b Institute of Solid State Physics, Russian Academy of Sciences

Abstract: For the B92 protocol with allowance for real attenuation and phase interruption of signal states in a one-dimensional optical fiber, a simple estimate is obtained for the critical length of the quantum communication channel that can provide secure key distribution.

PACS: 03.67.Dt, 42.50.-p, 89.70.+c

Received: 06.04.2004