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RANDOM NUMBER SEQUENCE GENERATION APPARATUS, QUANTUM ENCRYPTION TRANSMITTER, AND QUANTUM ENCRYPTION COMMUNICATION SYSTEM

外国特許コード F170009156
整理番号 (S2016-0356-N0)
掲載日 2017年8月24日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP004081
国際公開番号 WO 2017135444
国際出願日 平成29年2月3日(2017.2.3)
国際公開日 平成29年8月10日(2017.8.10)
優先権データ
  • 特願2016-019552 (2016.2.4) JP
発明の名称 (英語) RANDOM NUMBER SEQUENCE GENERATION APPARATUS, QUANTUM ENCRYPTION TRANSMITTER, AND QUANTUM ENCRYPTION COMMUNICATION SYSTEM
発明の概要(英語) A random number sequence generation apparatus 1 comprises: a semiconductor laser device 11 that repeatedly generates pulse laser light in which phases of pulses are random; an interferometer 12 that has a first transmission channel 22 and a second transmission channel 23 having mutually different transmission channel lengths, a first port 24 which is connected to an input end 20 side and to which pulse laser light is input, a second port 25 which is connected to an output end 21 side, and which outputs pulse laser light that has passed through any of the transmission channels, and a third port 26 that is connected to the input end 20 side; a Faraday mirror 50 which is connected to the second port 25, and which reflects pulse laser light; a photodiode 51 which is connected to the third port 26, and which outputs an electric signal in accordance with interference light of pulse laser light that has been reflected by the Faraday mirror 50 and passed through any of the transmission channels; and an AD converter 53 that generates a random number sequence on the basis of a magnitude relationship between signal intensity of the electric signal and a threshold.
従来技術、競合技術の概要(英語) BACKGROUND ART
Conventional, safe information theory of the quantum cryptography communication system for transmitting information is known. In the quantum cryptography communication system, the sender of the information, to the recipient, photon quantum key distribution (QKD: Quantum Key Distribution) to transmit the encryption key. In this way, the sender and the receiver, information about the encryption key obtained by a third party (eavesdropping) can be shared without. The sender, the recipient of the information to be transmitted to the encrypted using the encryption key. Then, the sender, the encrypted information is transmitted to the recipient by any communication means. The receiver, the encrypted information is decrypted using the encryption key.
The encryption key may be, is obtained based on a random number sequence. Such as the random sequence, an unpredictable physical theory information is necessary to use a random, pseudo-random number is generated based on the algorithm may not be used. In addition, in order to respond to the communication speed information, the random number sequence, for example a few GB/s or more is required that the rate of production.
In the quantum key distribution, information about the encryption key from the third party to intercept the photons, the uncertainty principle of quantum state is changed and the photon, leaving traces of eavesdropping. Therefore, the sender and the receiver, to ensure that the tapping can be detected. In such a quantum key distribution can be performed as a quantum cryptography communication system, is disclosed in Patent Document 1, a semiconductor laser device, an interferometer, and a random number source, a quantum cryptography system having a transmitter have been described.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • HOKKAIDO UNIVERSITY
  • 発明者(英語)
  • TOMITA Akihisa
  • NAKATA Kensuke
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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