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

Foreign code F170009156
File No. (S2016-0356-N0)
Posted date Aug 24, 2017
Country WIPO
International application number 2017JP004081
International publication number WO 2017135444
Date of international filing Feb 3, 2017
Date of international publication Aug 10, 2017
Priority data
  • P2016-019552 (Feb 4, 2016) JP
Title RANDOM NUMBER SEQUENCE GENERATION APPARATUS, QUANTUM ENCRYPTION TRANSMITTER, AND QUANTUM ENCRYPTION COMMUNICATION SYSTEM
Abstract 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.
Outline of related art and contending technology 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.
Scope of claims (In Japanese)[請求項1]
パルス発振して、パルス毎の位相が乱雑なパルスレーザ光を繰り返し生成する半導体レーザ装置と、
互いに異なる伝送路長を有する第1伝送路及び第2伝送路と、前記第1伝送路及び前記第2伝送路の入力端側に接続され、前記パルスレーザ光が入力される第1ポートと、前記第1伝送路及び前記第2伝送路の出力端側に接続され、前記第1ポートに入力されて前記第1伝送路又は前記第2伝送路を経由した前記パルスレーザ光のそれぞれを出力する第2ポートと、前記入力端側に接続された第3ポートと、を有する干渉計と、
前記第2ポートに接続され、前記第2ポートから出力される前記パルスレーザ光を反射して前記第2ポートに再び入力する光反射部と、
前記第3ポートに接続され、前記光反射部により前記第2ポートに入力されて前記第1伝送路又は前記第2伝送路を経由した前記パルスレーザ光の干渉光が入力されると共に、前記干渉光が入力されたことに応じて電気信号を出力するフォトダイオードと、
前記電気信号の信号強度と予め設定された閾値との大小関係に基づいて乱数列を生成するAD変換部と、を備える、乱数列生成装置。
[請求項2]
前記AD変換部において生成された前記乱数列を記憶する乱数列記憶部を更に備える、請求項1記載の乱数列生成装置。
[請求項3]
前記AD変換部において生成された前記乱数列に対して乱数性の検証を実行し、前記検証に適合した前記乱数列を前記乱数列記憶部に出力する乱数性検定部を更に備える、請求項2記載の乱数列生成装置。
[請求項4]
請求項2又は3記載の乱数列生成装置を備える量子暗号送信機であって、
前記干渉計は、前記出力端側に接続され、前記第1ポートに入力されて前記第1伝送路又は前記第2伝送路を経由した前記パルスレーザ光のそれぞれを出力する第4ポートを更に有し、
前記第4ポートから出力される前記パルスレーザ光の光強度及び位相を前記乱数列記憶部に記憶された前記乱数列に基づいて変調する変調部を備える、量子暗号送信機。
[請求項5]
請求項4記載の量子暗号送信機を備える量子暗号通信システムであって、
前記変調部によって光強度及び位相を変調された前記パルスレーザ光を前記量子暗号送信機との間で量子通信する量子暗号受信機を備える、量子暗号通信システム。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • HOKKAIDO UNIVERSITY
  • Inventor
  • TOMITA Akihisa
  • NAKATA Kensuke
IPC(International Patent Classification)
Specified countries 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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