Mr. Alexander V. Khmelev Profile

Alexander V. Khmelev

at Russian Quantum Ctr

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Proceedings Article | 31 January 2022 Paper

Elements of satellite quantum network

V. Kurochkin, A. Khmelev, V. Mayboroda, R. Bakhshaliev, A. Duplinsky, Y. Kurochkin

Proceedings Volume 12157, 121571T (2022) https://doi.org/10.1117/12.2624443

KEYWORDS: Satellites, Telescopes, Quantum key distribution, Quantum networks, Cameras, Receivers, Quantum communications, Signal detection, Optical fibers, Mirrors

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Long-distance quantum key distribution (QKD) is a critical component of a quantum network. When network users are within a city, they often use existing telecommunication fiber-optic networks. This method is problematic for QKD on a large scale between cities and countries. Direct connecting of distant consumers with quantum single-photon lines is not possible, because optical fiber involves attenuation. This problem is addressed by constructing a large number of trusted intermediate nodes, but there are concerns with the reliability of each node. To increase the quantum network's dependability, a method of building a satellite quantum network is actively developing. The only one trusted satellite node is required for satellite QKD between any two points on the Earth's surface. Furthermore, a satellite quantum link can also be utilized to add another communication channel in the existing fiber-optic networks that are thousands of kilometers apart. We describe the creation of ground infrastructure elements for receiving single photons in various polarization quantum states from satellites. Ground-based receiving nodes are based on two telescopes with an aperture of 1.2 m and 0.6 m located in remote cities.

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