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    • 2. 发明申请
    • QUANTUM CRYPTOGRAPHY SYSTEM
    • 量子系统
    • WO2008016201A1
    • 2008-02-07
    • PCT/KR2006/004087
    • 2006-10-11
    • KOREA INSTITUTE OF SCIENCE AND TECHNOLOGYMOON, Sung-WookPARK, Jun-BumPARK, Chul-WooLEE, Kyung-WoonLEE, Seung-HunSHIN, Hyun-Joon
    • MOON, Sung-WookPARK, Jun-BumPARK, Chul-WooLEE, Kyung-WoonLEE, Seung-HunSHIN, Hyun-Joon
    • G02B6/036
    • H04L9/0852G02B6/03633G02B6/03644G02B6/2861
    • Disclosed are a quantum cryptography system comprising a transmitting part and a receiving part. The transmitting part include a first optical fiber array of longer and shorter optical fibers for imparting a first path difference to an optical signal introduced from a light source, thereby dividing the optical signal into two signals having the first path difference, a first phase modulator for phase-modulating one of the signals propagating along the longer optical fiber and an attenuator for producing single photons respectively from the two signals, which are divided by the first path difference of the first optical fiber array. The receiving part includes a second optical fiber array of longer and shorter optical fibers for imparting a second path difference to the signals, which are received from the transmitting part through a quantum channel and have the first path difference, a second phase modulator for phase-modulating corresponding signal propagating along the longer optical fiber of the second optical fiber array and detector for detecting interferences between the signals outputted from the second optical fiber array. Each of the optical fibers of the transmitting part and the receiving part comprises a core containing B 2 O 3 and the balance being SiO 2 and GeO 2 , an inner cladding layer arranged around the core and composed of SiO 2 and at least one additive of F and P added to SiO 2 and an outer cladding layer arranged on the inner cladding layer and composed of SiO 2 .
    • 公开了一种包括发送部分和接收部分的量子密码系统。 发送部分包括用于对从光源引入的光信号施加第一路径差的由较长和较短光纤组成的第一光纤阵列,从而将光信号划分为具有第一路径差的两个信号,第一相位调制器, 相位调制沿着较长光纤传播的信号中的一个信号和用于分别由第一光纤阵列的第一路径差划分的两个信号产生单个光子的衰减器。 接收部分包括用于对通过量子信道从发射部分接收并且具有第一路径差异的信号给予第二路径差的用于给予第二路径差的第二光纤阵列, 调制沿着第二光纤阵列的较长光纤传播的相应信号和检测器,用于检测从第二光纤阵列输出的信号之间的干扰。 发送部分和接收部分的每个光纤包括含有B 2 O 3 N 3的核心,其余为SiO 2和GeO 由芯子构成的由SiO 2组成的内包层和添加到SiO 2的F和P的至少一种添加剂构成的内包层,以及 外包层,其设置在内包层上并由SiO 2组成。