Optimized frequency recovery of the satellite quantum signal

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We developed the frequency recovery method of laser pulses necessary for synchronizing quantum states transmitted from a satellite and registered at a ground station. Experimental modeling of a quantum key distribution session between a satellite and a ground station is also considered. The data obtained during the experiment were used to test the method of recovering the repetition frequency.

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作者简介

A. Chernov

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

编辑信件的主要联系方式.
Email: chernov.an@phystech.edu
俄罗斯联邦, Dolgoprudny; Moscow; Moscow

A. Khmelev

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

Email: chernov.an@phystech.edu
俄罗斯联邦, Dolgoprudny; Moscow; Moscow

V. 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: chernov.an@phystech.edu
俄罗斯联邦, Dolgoprudny; Moscow; Moscow; Moscow

参考

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2. Fig. 1. Schematic diagram of the experimental setup. 1 - pulse generator, 2 - frequency modulator, 3 - laser diode, 850 nm, 4 - amplitude modulator, 5 - attenuator, 6 - polariser, 7 - electrically driven half-wave plate, 8 - single photon detector, 9 - time-digital converter

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3. Fig. 2. Estimated distance to the satellite passing through the zenith of the ground station used in the modelling of the AAC session: red points - GPS data, blue curve - approximation (a). Relative velocity of the satellite during the modelled session (b)

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4. Fig. 3. Comparison of signal repetition rates obtained during the simulation of the QRC session before (1) and after (2) approximate compensation of the Doppler effect (a). Quantum signal repetition rate after compensation of the Doppler effect (b)

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5. Fig. 4. Temporal distribution of quantum signals inside the reconstructed sequence period (1, red crosses) and its approximation (2, blue curve) by the Gaussian function σ = 1.21 (a). Number of signals falling inside the filtering time window as a function of its width (b)

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