| Autor: | Rumyantsev, K.E., Rudinsky, E.A. |
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| Jazyk: | ruština |
| Rok vydání: | 2018 |
| Předmět: | |
| DOI: | 10.23683/2311-3103-2018-5-56-68 |
| Popis: | Solving the problem of secrecy in the process of key distribution is based on the principles of the encoding of the photon quantum state. Analysis of information strategies in quantum systems shows that the implementation of the multiphoton mode in the synchronization process potentially makes it easier unauthorized access to information. This determines the researching of methods and algorithms for synchronization of quantum key distribution (QKD) systems with automatic compensation of polarization distortions that provide increased protection from unauthorized access. The synchronization process protecting of auto-compensation QKD systems from unauthorized access is investigated. The synchronization algorithm allows the use of single-photon avalanche photodiodes (SPAD) with a significant time delay between the moment of photon reception, avalanche formation, its quenching and subsequent recovery. In this article we describe the graph-analytical method for estimating single-photon synchronization parameters of an autocompensation quantum key distribution system. In this paper is formed and described diagram of states and transitions for random search for a photon pulse with allowance for false detection. Based on the results of the analysis, expressions are defined for calculating the mathematical expectation, dispersion and average number of steps spent on the synchronization process. The interval for the average number of steps used for the synchronization process is determined. The average synchronization time according to the proposed algorithm is estimated considering the probability of false alarm. The calculations showed that the error in determining the mean synchronization time according to the expressions is no more than 1.7 %. Thus, the graph-analytic method for estimating the single-photon synchronization parameters of the QKD autocompensation system allows to determine the statistical characteristics and the average synchronization time with a low error. |
| Databáze: | OpenAIRE |
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