S. N. Molotkov, “On the resistance of the quantum key distribution with phase-time encoding for long communication channels”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2008, Volume 88, Issue 4,Pages <nobr>315

This article is cited in 1 paper

QUANTUM INFORMATION SCIENCE

On the resistance of the quantum key distribution with phase-time encoding for long communication channels

S. N. Molotkov^abc

^a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
^b Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, Russia
^c Academy of Cryptography of the Russian Federation, Moscow, Russia

Abstract: The cryptographic resistance of a quantum key distribution protocol with phase-time encoding has been analyzed for the case of a nonstrictly single-photon source and a communication channel with losses. It has been shown that eavesdropper’s information on the key for a long communication channel is determined only by the von Neumann entropy of the source at the receiver side and the critical length of the communication channel is determined primarily by dark counts of photodetectors.

PACS: 03.65.Hk, 03.67.Dd

Received: 15.05.2008
Revised: 07.07.2008