FIELD: quantum information.
SUBSTANCE: invention can be used for investigation of protection of fiber optic element against "Trojan Horse" attack. Essence of the invention consists in the fact that the degree of transmission of the optical element is determined by measuring the power of the laser radiation passing through the analyzed optical element using a continuous laser with a known power, wherein permanent magnets are used, which are brought into contact with the investigated optical element, or an ultrasound source is used, which is directed to the investigated optical element.
EFFECT: possibility of taking into account external magnetic and acoustic effects of an intruder when analyzing security of quantum key distribution systems against "Trojan Horse" attacks.
2 cl, 1 dwg
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