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Pis'ma v Zh. Èksper. Teoret. Fiz., 2017, Volume 106, Issue 2, Pages 108–114 (Mi jetpl5324)  

QUANTUM INFORMATION SCIENCE

Control of distributed interference in the one-way quantum cryptography system

K. A. Balygina, A. N. Klimovab, S. P. Kulika, S. N. Molotkovcde

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

Abstract: The possibility of controlling interference in two spaced fiber MachZehnder interferometers and maintaining a nearly ideal visibility has been demonstrated for the one-way quantum cryptography system directly in the key distribution process through a communication channel with a length of 50 km. It has been shown that the deviation of the visibility from ideal is certainly due to the detected difference between the numbers of 0s and 1s in the raw (sifted) key. For this reason, an interferometer can be balanced only in the quasi-singlephoton mode without the interruption of the process of key distribution by using the difference between the numbers of 0s and 1s in the raw key as an indicator of an error. The proposed approach reduces the balancing time and, furthermore, does not require additional exchanges through an open communication channel.

Funding Agency Grant Number
Russian Science Foundation 16-12-00015
Ministry of Education and Science of the Russian Federation 03.625.31.0254


DOI: https://doi.org/10.7868/S0370274X17140107

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English version:
Journal of Experimental and Theoretical Physics Letters, 2017, 106:2, 120–126

Bibliographic databases:

Received: 26.05.2017
Revised: 19.06.2017

Citation: K. A. Balygin, A. N. Klimov, S. P. Kulik, S. N. Molotkov, “Control of distributed interference in the one-way quantum cryptography system”, Pis'ma v Zh. Èksper. Teoret. Fiz., 106:2 (2017), 108–114; JETP Letters, 106:2 (2017), 120–126

Citation in format AMSBIB
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\paper Control of distributed interference in the one-way quantum cryptography system
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
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\vol 106
\issue 2
\pages 108--114
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\jour JETP Letters
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\pages 120--126
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