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Workshop on Recent Advances in Photonics (WRAP)

Interface of the Quantum Key Distribution System

Anton Pavlovich Pljonkin

Published Dec 1, 2017• 0 citations
Publisher

Abstract

The fiber-optical quantum key distribution system with phase coding of photon states is investigated. A description of the principle of the system operation in the mode of forming quantum keys is given. A synchronization process is described, which consists in detecting a time interval with an optical pulse. The results of experimental studies are presented and the basic requirements for the hardware of the quantum key distribution system are formulated. The structural scheme of the interaction interface of the self-compensation quantum key distribution system is shown taking into account the features of the detection equipment. The main parameters and relationships that should be taken into account when developing the interface model are given.

DOI
10.1109/wrap.2017.8468591

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The fiber-optical quantum key distribution system with phase coding of photon states is investigated. A description of the principle of the system operation in the mode of forming quantum keys is given. A synchronization process is described, which consists in detecting a time interval with an optical pulse. The results of experimental studies are presented and the basic requirements for the hardware of the quantum key distribution system are formulated. The structural scheme of the interaction interface of the self-compensation quantum key distribution system is shown taking into account the features of the detection equipment. The main parameters and relationships that should be taken into account when developing the interface model are given.
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A typical structure of an auto-compensation system for quantum key distribution is given. The principle of operation of a fiber-optic system for the distribution of quantum keys with phase coding of photon states is described. The operation of the system in the synchronization mode and the formation of quantum keys was investigated. The process of detecting a time interval with an optical synchronization pulse is analyzed. The structural scheme of the experimental stand of the quantum-cryptographic network is given. Data are obtained that attest to the presence of a multiphoton signal during the transmission of sync pulses from the transceiver station to the coding and backward direction. The results of experimental studies are presented, which prove the existence of a vulnerability in the process of synchronization of the quantum key distribution system. It is shown that the use of a multiphoton optical pulse as a sync signal makes it possible for an attacker to unauthorized access to a quantum communication channel. The experimental results show that tapping a portion of the optical power from the quantum communication channel during the synchronization process allows an attacker to remain unnoticed while the quantum protocol is operating. Experimentally proved the possibility of introducing malfunctions into the operation of the quantum communication system at the stage of key formation, while remaining invisible for control means.
The autocompensation quantum key distribution system with phase coding of photon states is investigated. The principle of operation of a fiber-optic system for the distribution of quantum keys is described. The analysis of the synchronization mode and the formation of quantum keys is carried out. The description of the experimental stand of the quantum-cryptographic network is given. The description of the software of the receiving-transmitting and coding stations is given. It is shown that in the synchronization process the time interval is determined to within picoseconds. The process of creating a virtual tunnel between two stations is described. The description of the full cycle of integration of quantum keys into algorithms of data encryption of a telecommunication network is given. It is shown, how length of the quantum channel of communication influences the process of formation of quantum keys. The possibility of using 256-bit quantum keys in the AES encryption algorithm has been experimentally proven.
A typical structure of an auto-compensation system for quantum key distribution is given. The principle of operation of a fiber-optic system for the distribution of quantum keys with phase coding of photon states is described. The operation of the system in the synchronization mode and the formation of quantum keys was investigated. The process of detecting a time interval with an optical synchronization pulse is analyzed. The structural scheme of the experimental stand of the quantum-cryptographic network is given. Data are obtained that attest to the presence of a multiphoton signal during the transmission of sync pulses from the transceiver station to the coding and backward direction. The results of experimental studies are presented, which prove the existence of a vulnerability in the process of synchronization of the quantum key distribution system. It is shown that the use of a multiphoton optical pulse as a sync signal makes it possible for an attacker to unauthorized access to a quantum communication channel. The experimental results show that tapping a portion of the optical power from the quantum communication channel during the synchronization process allows an attacker to remain unnoticed while the quantum protocol is operating. Experimentally proved the possibility of introducing malfunctions into the operation of the quantum communication system at the stage of key formation, while remaining invisible for control means.
A two-pass fiber-optic quantum key distribution system with phase-encoded photon states in synchronization mode has been investigated. The possibility of applying the analytical expressions for the calculation of the correct detection probability of the signal time window at synchronization has been proved. A modernized algorithm of photon pulse detection, taking into account the dead time of the single-photon avalanche photodiode was proposed. The method of engineering an optical pulse detection process during the synchronization in a quantum key distribution system has been offered.