S. N. Molotkov, “On the security of fiber optic quantum cryptography systems without the control of the intensity of quasi-single-photon coherent states”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2015, Volume 101, Issue 8,Pages <nobr>637

This article is cited in 9 papers

QUANTUM INFORMATION SCIENCE

On the security of fiber optic quantum cryptography systems without the control of the intensity of quasi-single-photon coherent states

S. N. Molotkov^abc

^a Academy of Cryptography of the Russian Federation, Moscow, 121552, Russia
^b Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
^c Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, 119991, Russia

Abstract: Internal losses in systems of quantum cryptography can be used at attacks by an eavesdropper. As a result, the security of keys cannot be ensured for a number of protocols. This problem can be solved by using geometrically uniform coherent states with a larger number of bases. The security of keys at the number of bases $N_b/2=4$ and the number of states $N_b=8$ can be guaranteed even without the control of the intensity of input states.

Received: 09.02.2015
Revised: 10.03.2015

DOI: 10.7868/S0370274X15080135