Geodesic
Increase of signal to reference ratio for phase compensation in continuous-variable quantum key distribution systems
Nanosistemy: fizika, himiâ, matematika, Tome 14 (2023) no. 1, pp. 59-68.

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Continuous variables quantum key distribution (CV-QKD) systems are a promising direction for quantum communications. Coherent detection, which is the basis of CV-QKD, requires taking into consideration and compensating phase distortions. Phase compensation algorithms rely on using reference pulses for phase drift estimation and correcting signal quadratures. The ratio of the number of reference pulses to that of the signal ones, affects the accuracy of the phase compensation algorithm. On the other hand, it influences the secure key rate (SKR). The paper considers the effect of the reference to signal ratio on the SKR, and proposes a modification of the phase compensation algorithm, which allows using a smaller number of references at a pulse repetition frequency close to that of the system phase noise, which results in increasing SKR. We also propose a method for estimating the phase noise in the system for selection of the optimal signal to reference ratio.
Keywords: continuous-variable quantum key distribution, quantum communications, algorithm.
Mots-clés : phase noise, phase compensation 
@article{NANO_2023_14_1_a6,
     author = {Fedor M. Goncharov and Boris E. Pervushin and Boris A. Nasedkin and Roman K. Goncharov and Daniil A. Yashin and Mikhail E. Gellert and Danil V. Sulimov and Polina A. Morozova and Ilya M. Filipov and Iurii A. Adam and Vladimir V. Chistiakov and Eduard O. Samsonov and Vladimir I. Egorov},
     title = {Increase of signal to reference ratio for phase compensation in continuous-variable quantum key distribution systems},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {59--68},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2023_14_1_a6/}
}
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AU  - Daniil A. Yashin
AU  - Mikhail E. Gellert
AU  - Danil V. Sulimov
AU  - Polina A. Morozova
AU  - Ilya M. Filipov
AU  - Iurii A. Adam
AU  - Vladimir V. Chistiakov
AU  - Eduard O. Samsonov
AU  - Vladimir I. Egorov
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%A Boris E. Pervushin
%A Boris A. Nasedkin
%A Roman K. Goncharov
%A Daniil A. Yashin
%A Mikhail E. Gellert
%A Danil V. Sulimov
%A Polina A. Morozova
%A Ilya M. Filipov
%A Iurii A. Adam
%A Vladimir V. Chistiakov
%A Eduard O. Samsonov
%A Vladimir I. Egorov
%T Increase of signal to reference ratio for phase compensation in continuous-variable quantum key distribution systems
%J Nanosistemy: fizika, himiâ, matematika
%D 2023
%P 59-68
%V 14
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NANO_2023_14_1_a6/
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Fedor M. Goncharov; Boris E. Pervushin; Boris A. Nasedkin; Roman K. Goncharov; Daniil A. Yashin; Mikhail E. Gellert; Danil V. Sulimov; Polina A. Morozova; Ilya M. Filipov; Iurii A. Adam; Vladimir V. Chistiakov; Eduard O. Samsonov; Vladimir I. Egorov. Increase of signal to reference ratio for phase compensation in continuous-variable quantum key distribution systems. Nanosistemy: fizika, himiâ, matematika, Tome 14 (2023) no. 1, pp. 59-68. http://geodesic.mathdoc.fr/item/NANO_2023_14_1_a6/