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ISSN: 1023-5086


ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2023-90-02-03-10

УДК: 530.145:535.12:681.7:53.082.5

The impact of polarization control system on the parameters of continuous variables quantum key distribution system

For Russian citation (Opticheskii Zhurnal):

Геллерт М.Е., Сулимов Д.В., Наседкин Б.А., Гончаров Р.К., Филипов И.М., Морозова П.А., Гончаров Ф.М., Яшин Д.А., Чистяков В.В., Самсонов Э.О., Егоров В.И., Первушин Б.Е., Адам Ю.А. Влияние системы поляризационного контроля на параметры системы квантового распределения ключа на непрерывных переменных // Оптический журнал. 2023. Т. 90. № 2. С. 3–10. http:


Gellert M.E., Sulimov D.M., Nasedkin B.A., Goncharov R.K., Filipov I.M., Morozova P.A., Goncharov F.M., Yashin D.A., Chistyakov V.V., Samsonov E.O.,  Egorov V.O., Pervushin B.E., Adam Iu. A.The impact of polarization control system on the parameters of continuous variables quantum key distribution system (In Russian) // Opticheskii Zhurnal.  2023. V. 90. № 2. P. 3–10. http:

For citation (Journal of Optical Technology):

M. E. Gellert, D. V. Sulimov, B. A. Nasedkin, R. K. Goncharov, I. M. Filipov, P. A. Morozova, F. M. Goncharov, D. A. Yashin, V. V. Chistiakov, E. O. Samsonov, V. I. Egorov, B. E. Pervushin, and I. A. Adam, "Impact of the polarization control system on continuous-variable quantum key distribution system parameters," Journal of Optical Technology. 90(2), 55-58 (2023).


Subject of study. This paper considers a polarization control method of optical radiation for a continuous variables quantum key distribution system for correct polarization demultiplexing of the local oscillator and signal state necessary to ensure the correct performance of the presented system. Aim of study. The aim of this work is to develop a system of active polarization control and experimental evaluation of the effect of this system on the parameters of continuous variables quantum key distribution system. Method. The polarization control system considered in this paper is based on a constant analysis of the local oscillator radiation and maximization of its intensity due to the stochastic gradient descent algorithm. Because of the principle of active polarization control operation, local oscillator fluctuations occur. In order to evaluate the added noise  an experimental scheme simulating the sender and receiver module of the continuous variables quantum key distribution system is used. This scheme allows to evaluate the noise introduced by the controller operation. Main results. The excess noise caused by the polarization controller is comparable to the polarization noise generated in a quantum key distribution system. Practical significance. Correct operation of quantum key distribution system on continuous variables can be realized only with polarization control device. Data  on polarization control effect on the system gives understanding of how to design and develop quantum cryptography systems in future.


continuous variables quantum distribution of keys, polarization control, polarization noise, active polarization control algorithm, stochastic gradient descent algorithm

OCIS codes: 060.0060


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