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QUANTUM CRYPTOGRAPHIC KEY OUTPUT APPARATUS, QUANTUM CRYPTOGRAPHIC KEY COMMUNICATION SYSTEM, AND QUANTUM CRYPTOGRAPHIC KEY OUTPUT METHOD

外国特許コード F180009363
整理番号 (S2016-1093-N0)
掲載日 2018年4月19日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2017JP031800
国際公開番号 WO 2018043742
国際出願日 平成29年9月4日(2017.9.4)
国際公開日 平成30年3月8日(2018.3.8)
優先権データ
  • 特願2016-173063 (2016.9.5) JP
発明の名称 (英語) QUANTUM CRYPTOGRAPHIC KEY OUTPUT APPARATUS, QUANTUM CRYPTOGRAPHIC KEY COMMUNICATION SYSTEM, AND QUANTUM CRYPTOGRAPHIC KEY OUTPUT METHOD
発明の概要(英語) A quantum cryptographic key output apparatus 1 comprises: a semiconductor laser device 10 that repetitively generates a pulse laser light L; an encoder 11 that encodes the pulse laser light on the basis of a quantum cryptographic key; a light branch unit 12 that branches the pulse laser light L; and an attenuator 13 that attenuates the optical intensity of a first pulse laser light L1 such that the number of photons of the first pulse laser light L1 becomes equal to any one of a plurality of candidate values that are values equal to or less than one. The quantum cryptographic key output apparatus 1 also comprises: an optical intensity determination unit 15 that determines whether the optical intensity of a second pulse laser light L2 is within a predetermined range; and an information output unit 16 that outputs, to a quantum cryptographic key input apparatus 2, identification information for identifying the first pulse laser light L1 corresponding to the second pulse laser light L2 the optical intensity of which is not within the predetermined range.
従来技術、競合技術の概要(英語) BACKGROUND ART
Safety information theory for transmission of a quantum encryption key information is known a communication system. Quantum cryptography communication system, the sender of the information, quantum key distribution (QKD: Quantum Key Distribution) by, a photon quantum cryptography key is transmitted to the recipient. In addition, the sender, the recipient of information to be sent to the quantum encryption key, the encrypted information is transmitted to the recipient by any communication means. Then, the recipient, the encrypted encryption key is decrypted by the quantum information. Thus, the sender information is transmitted to a recipient. Here, the quantum encryption key is transmitted to the recipient from a sender at the time of wiretapping by a third party and the quantum cryptography key, a quantum cryptographic key with the quantum state of the photon varies depending on the uncertainty principle. Therefore, eavesdropping in the quantum encryption key to the trace of eavesdropping remains always photon and thus, the sender and the receiver, the eavesdropping of the quantum cryptography key can be reliably detected.
In the quantum key distribution, is received from a sender are transmitted to the key to the quantum encryption key distillation processing is executed. Key distillation processing is, for example eavesdropping, noise due to the quantum encryption key and the error correction of an error, such as eavesdropping of the information is leaked from the quantum encryption key, information leak can be regarded as not to generate a quantum cryptographic key with the confidentiality of the enhancement, including. Is a privacy, information of the leaked amount of the quantum cryptography key-related information (the leaked information amount) of the estimated upper limit, the upper limit of the estimated amount of information leakage according to the quantum cryptography key by reducing the amount of information, thereby improving the stability of the quantum cryptography key. As described above, in quantum key distribution, information theoretically secure transmission of information becomes possible.
In such a quantum key distribution quantum cryptography key can be executed as a communication system, the decoy BB84 is employed, pulse laser light source and repeatedly generated, the coded pulse laser light with information about the encryption key and generating an optical pulse encoder, the number of photons of the pulse laser light 1 is less than or equal to any one of the plurality of candidate values of the pulse laser light so that an attenuator which attenuates the light intensity and, by means of a known (for example, see Patent Document 1).
  • 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 JO 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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