Expression for estimating the reliability of information during its transmission through quantum-cryptographic communication channel that contains a dead time photon counter has been obtained in this research. According to the results of mathematical modeling, the dependence of the reliability of the received data on the average time of single photon transmission of information was established. Studies have shown that with an increase in the average time of single photon transmission of information, these dependences grow, reaching saturation. Moreover, with equal parameters with an increase in the average duration of the dead time of a prolonging type, saturation occurs at large values of the average time of a single photon transmission of information.
Receiving modules of single-photon communication systems should provide the smallest loss of transmitted information when measuring low-power optical signals. In this regard, it is advisable to use photon counters. They are the most highly sensitive, but characterized by data recording errors. The aim of this work was to develop a method for determining the intensity of recorded optical signal in a singlephoton communication channel with a receiving module based on a photon counter, which ensures the least probability of erroneous registration of transmitted binary symbols. Methods of achieving the least loss of information in asynchronous photon binary communication channel with a receiver-based photon counter has been developed. A device for implementing this methods has been created. The method is based on using the statistical distribution of the mixture of the number of dark and signal pulses received at the output of the photon counter when registering binary symbols "0" P st 0 (N) and symbols "1" P st 1 (N). The essence of the method consists in determining the intensities of optical signals for transmitting binary symbols ("0" and "1") and threshold levels of the pulses N 1 and N 2 registered
Кафедра защиты информации, УО «Белорусский государственный университет информатики и радиоэлектроники», г. Минск, Республика Беларусь; tamvks@mail.ru Ключевые слова: квантово-криптографический канал связи; мертвое время; счетчик фотонов. Аннотация: Определены выражения для оценки вероятностей ошибочной регистрации двоичных данных квантово-криптографического канала связи, содержащего счетчик фотонов с мертвым временем продлевающегося типа. По результатам математического моделирования установлены зависимости вероятностей ошибочной регистрации данных на выходе канала связи от среднего времени однофотонной передачи символов «0» и «1», на основе которых обоснован выбор наименьшего среднего времени передачи одного бита (символа), обеспечивающего наименьшие потери передаваемой информации. Полученные результаты позволяют повысить достоверность определения несанкционированного доступа к информации, передаваемой по дискретному двоичному асинхронному однородному квантово-криптографическому каналу связи без памяти и со стиранием. Введение
When transferring data over optical fiber communication channels, it is required to provide data security and the authenticity of their source. To limit the access to the data for a third party, there can be applied quantum-cryptographical systems which are supposed to transfer every data bit by means of low power optical signals containing radiation photons the number of which could be in the range from 10 to 1, however, are far from being perfect and suffer from shortcomings, the main of which being a large number of errors due to the depolarization effect of optical radiation. The aim of this work was, therefore, to create device for sending and receiving confidential data which could provide complete security of transferred data, inherent to quantum-cryptographical communication systems at the same time could have a low number of such errors.A device for quantum-cryptographic communication system with a photon counter applied as a receiving module has been proposed. The possibility to use silicon avalanche photodetectors operating in the photon counting mode for confidential information transmission systems and defining authenticity of the source of transmitted information has been shown.I develop modern optical fiber communication system incorporating avalanche photodetector photon counter as a receiving module, that allow to detect unauthorized access to information and violation of its integrity and speed up the exchange of information in comparison with well-known quantum-cryptographical communication systems.
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