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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.
特許請求の範囲(英語) [claim1]
1. In the quantum key used for the generation of the pulse laser light that has been encoded is generated, the pulse from the laser light by the optical pulse sequence is output to the input device in the quantum key to the quantum cryptography key output device, wherein the pulse laser light source generating repeated, wherein the quantum based on the cryptographic key wherein the pulse laser light output from an encoder, wherein the pulse laser light that has been encoded in the first optical path and the second 2 1 optical path so as to have a predetermined ratio of the light intensity and light branching part branches, wherein the first optical path 1 of the pulse laser light and wherein the first of the number of photons of the pulse laser light is 1 or below is a value 1 of a plurality of candidate values so as to become any one of the multiple, 1 wherein the first intensity of the pulsed laser light and an attenuator which attenuates the, wherein the attenuation section attenuates the intensity of light via the at least one second quantum encryption key 1 pulsed laser light to the optical output to the output of the input device, wherein the first optical path which has been branched 2 pulsed laser light wherein the first intensity of the laser light pulse 2 is within a predetermined range to determine whether or not the light intensity determining unit and, wherein the determiner determines that the light intensity within a predetermined range of light intensity has been determined to be not in the first pulsed laser beam 2 with the corresponding second identification information identifying the 1 pulsed laser light, the quantum cryptography key input device and the information output unit outputs, comprising, in the quantum key to the output device.
[claim2]
2. Wherein the determination section determines the light intensity, said first input 2 of the pulse laser light, said first input 2 of the pulse laser light to output an electric signal corresponding to the light intensity and the photoelectric conversion portions, which are output by the photoelectric converter based on the electrical signal, and the electrical signal according to 2 wherein the first of the pulse laser light to the light intensity is within a predetermined range to determine whether or not the comparing section, having, according to claim 1 quantum key to the output device.
[claim3]
3. Wherein the specific information, by said light source is repeatedly generated in the pulsed laser light wherein the first one of the pulse laser light according to 1, wherein the determiner determines that the light intensity within a predetermined range and the light intensity is determined to be not in the first pulse laser beam is 2 to 1 with the corresponding second of the pulse laser light including information as to the order, according to claim 1 or 2 quantum key to the output device.
[claim4]
4. Wherein the specific information, wherein the repeatedly generated by said light source according to 1 wherein the first pulsed laser light is pulse light in the laser beam, wherein the determiner determines that the light intensity within a predetermined range of light intensity is determined in the first pulsed laser beam with the corresponding second 2 1 comprises information as to the order of the pulse laser light, according to any one of claims 1-3 quantum key to the output device.
[claim5]
5. The encoder, wherein the pulse laser light is divided into a pair of pulses having a mutual interference of the interferometer, wherein the pulse phase of the laser light and a phase modulation unit to modulate, wherein modulating the light intensity of the pulse laser light and an intensity modulation unit, and, wherein the pulsed laser light, wherein the pair of interferometer divides the pulse, the phase modulating section for modulating the phase of the pulse laser light, and, wherein the intensity modulation unit by modulating the intensity of the pulsed laser light by, encoding the pulse laser light, according to any one of claims 1-4 quantum key to the output device.
[claim6]
6. Wherein the phase modulation section performs, in a stage subsequent to the interferometer is arranged, according to claim 5 quantum key to the output device.
[claim7]
7. Wherein any one of claims 1-6 quantum key and the output device, wherein said quantum encryption key to the optical pulse train output by the output device in the quantum key input and the input device, and comprising, wherein the input device is a quantum cryptography key, wherein the optical output section which has been output by the first pulse laser beam 1 and the light input unit is input, wherein the information output by the output section the information inputted by the input unit and the specific information, wherein the first light input by the input unit 1 from the pulsed laser light, wherein the information input by the input unit specified by said specific information excluding the 1 pulsed laser light having a second, new quantum cryptographic key and the key distillation, comprising, in the quantum key communication system.
[claim8]
8. In the quantum cryptography key used to generate the coded pulse laser light is generated, the pulse laser light from the optical pulse train output to the device in the quantum key input method of the quantum encryption key output, wherein the light emitting to repeatedly produce the pulse laser light, the quantum cryptography key on the basis of the pulse laser light wherein the coding step and a, wherein the pulse laser light that has been encoded in the optical path of the first and second 1 2 optical path so as to have a predetermined ratio of the light intensity of an optical branching step and branches, the first optical path 1 of the pulse laser light wherein the number of photons of the first pulse laser beam is 1 1 value is equal to any one of the plurality of candidate values so as to become, 1 wherein the first light intensity of the pulse laser light and an attenuator which attenuates the step, for attenuating optical intensity 1 and the pulsed laser light to the at least one second input device in the quantum key wherein the optical signal output to the output step, the first optical path which has been branched 2 pulse of the pulse laser light of the laser beam 2 and the second light intensity is within a predetermined range to determine whether or not the light intensity and the determination step, and the light intensity is determined not to be within a predetermined range of said first and second 2 pulsed laser light is pulsed laser light corresponding to the identification information identifying the 1, wherein the quantum key input device and outputs the information output step, comprising, in the quantum cryptography key in the output method.
  • 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 (WO201843742)
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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