METHOD FOR DETECTING OPTICAL SIGNAL IN QUANTUM NETWORKS

Abstract

The article presents a method for detecting an optical synchronization signal for a section of a
quantum communications network. The objective of the article is to present a variant of implementing an
urban quantum network. The paper considers a proposed solution to the problem of configuring a synchronization
channel for quantum communication systems with a non-standard topology. A generalized
operating principle of a quantum key distribution system with phase coding is described. A synchronization
algorithm adapted for configuring an urban quantum network containing several segments is proposed.
A feature of the proposed scheme is the presence of one receiving and transmitting station with
which several coding stations interact. The article presents the results of analyzing the energy model of
the proposed method and calculating the average losses in the quantum channel. In conclusion, we discuss
possible variants of the structure of quantum networks and the applicability of synchronization processes
in them. Quantum communications networks are actively scaling and use various quantum key distribution,
authentication, and synchronization protocols. Quantum key distribution (QKD) solves the central
problem of symmetric cryptography and is a secure technology for generating an identical bit sequence
for two remote users. Theoretically, the security (resistance) of such technology does not depend on the
computing power of hackers, who, for example, may have a quantum computer. However, the practical
implementation of theoretical models still shows technical imperfection, which allows attackers to find
vulnerabilities. When researching and designing various modifications of quantum key distribution systems
(QKDS), it is necessary to pay attention not only to the issues of the stability of quantum protocols,
but also to the components of the technical implementation of the equipment.