Improving length estimation of the secret key in satellite-to-ground quantum channel

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Abstract

We study and optimize the length of the secret sequence depending on the intervals of splitting the communication session between the satellite and the ground station during the quantum key distribution. Due to dynamically changing channel parameters, the proposed technique allows for significant increases in the final key rate and length.

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About the authors

Е. I. Ivchenko

Moscow Institute of Physics and Technology; International Center for Quantum Optics and Quantum Technologies; QSpace Technologies LLC; MISIS National University of Science and Technology

Author for correspondence.
Email: ivchenko.ei@phystech.edu
Russian Federation, Dolgoprudny; Moscow; Moscow; Moscow

A. V. Khmelev

Moscow Institute of Physics and Technology; International Center for Quantum Optics and Quantum Technologies; QSpace Technologies LLC

Email: ivchenko.ei@phystech.edu
Russian Federation, Dolgoprudny; Moscow; Moscow

V. L. Kurochkin

Moscow Institute of Physics and Technology; International Center for Quantum Optics and Quantum Technologies; QSpace Technologies LLC; MISIS National University of Science and Technology

Email: ivchenko.ei@phystech.edu
Russian Federation, Dolgoprudny; Moscow; Moscow; Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Histograms of the dependence of the number of received clicks (a) and the percentage of quantum bit errors (QBER) in them (b) for the case of small fluctuations in the neighbourhood of the model averages

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3. Fig. 2. Histograms of the dependence of the number of received clicks (a) and the percentage of quantum bit errors (QBER) in them (b) for the case of significant fluctuations, which can be associated with the instability of the experimental equipment and bad weather conditions

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4. Fig. 3. Plots of the dependence of the final key length on the size of the segments of the session interval partitioning in the case of small fluctuations (a) and for large deviations (b) of the number of clicks from the theoretical average

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