GENERATION OF THE QUANTUM KEY IN A SINGLE-PHOTON COMMUNICATION SYSTEM
D. B. Tretyakov1,2, A. V. Kolyako1,2,3, A. S. Pleshkov1,2,4, V. M. Entin1,2, I. I. Ryabtsev1,2, I. G. Neizvestyi1
1Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, prosp. Lavrent'eva, 13
2Novosibirsk State University, 630090, Novosibirsk, ul. Pirogova, 2
3Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, pr. Lavrentiev, 13/3
4Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, pr. Academika Koptyuga, 1
Keywords: квантовая криптография, генерация квантового ключа, одиночные фотоны, quantum cryptography, quantum key generation, single photons
Abstract
This paper presents a brief review of experimental works in the field of quantum cryptography and quantum key generation by means of single photons in the atmospheric and fiber quantum communication lines. This paper given the description of two experimental devices for quantum key generation, which were designed at the Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences. The results of the study of the dependence of the speed of the quantum key generation on the average number of photons $\mu$ in the laser pulse are given. There is a discrepancy between theory and experiment found for $\mu>0.3$, which may be due to nonzero probability of occurrence of multiphoton pulses in the quantum transmission, which are detected by the single photon detectors as single-photon pulses. When it comes to sieving the quantum key, the cases with simultaneous triggering of several single-photon detectors are ignored because the measurement result is not determined.
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