公开(公告)号：US20070058810A1

公开(公告)日：2007-03-15

申请号：US11482016

申请日：2006-07-07

申请人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

发明人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

IPC分类号： H04N7/167

CPC分类号： H04L9/0852

摘要： A sender transmits to a receiver an optical signal that is phase-modulated in accordance with source data and a basis stored in a memory. The receiver phase-modulates the received optical signal in accordance with a basis, obtains detection data through interference, and stores the detection data in a memory. An inter-device address difference (GD) and an intra-device address difference (DI) are provisionally set. The detection data are checked against the source data while sequentially changing the values of GD and DI within a predetermined adjustment range. Based on the result of this checking, GD and DI are determined.

摘要翻译： 发送方向接收机发送根据源数据和存储在存储器中的基准进行相位调制的光信号。 接收机根据基础对接收的光信号进行相位调制，通过干扰获得检测数据，并将检测数据存储在存储器中。 临时设置设备间地址差异（G SUB）和设备间地址差异（D SUB I / I）。 在预定的调节范围内顺序地改变G D D和D I I的值，检测数据与源数据相对应。 基于该检查的结果，确定了G＆D＆D＆D＆gt;和D＆lt; I＆lt; / SUB＆gt;。

公开(公告)号：US20050180575A1

公开(公告)日：2005-08-18

申请号：US11056183

申请日：2005-02-14

申请人： Wakako Maeda ,  Shuji Suzuki ,  Akio Tajima ,  Seigo Takahashi ,  Akihiro Tanaka

发明人： Wakako Maeda ,  Shuji Suzuki ,  Akio Tajima ,  Seigo Takahashi ,  Akihiro Tanaka

IPC分类号： H04L9/12 ,  H04B10/00 ,  H04B10/548 ,  H04B10/70 ,  H04L7/00 ,  H04L7/04 ,  H04L9/00 ,  H04L9/08

CPC分类号： H04L9/12 ,  H04L7/0008 ,  H04L7/0075 ,  H04L9/0852

摘要： A clock signal of a master clock of a sender is transmitted to a receiver through a classical channel and is returned from the receiver. The clock signal is transmitted with strong light from a sender-side quantum unit to a receiver-side quantum unit through a quantum channel. A sender-side synchronization section establishes phase synchronization between the clock signal returned from the receiver and the clock signal detected by the sender-side quantum unit, and generates a calibration clock signal. At the receiver as well, a receiver-side synchronization section establishes phase synchronization between the clock signal detected from the classical channel and the clock signal detected by the receiver-side quantum unit, and generates a calibration clock signal.

摘要翻译： 发送器的主时钟的时钟信号通过经典通道发送到接收器，并从接收器返回。 时钟信号通过量子通道从发射侧量子单元到接收器侧量子单元的强光传输。 发送侧同步部分建立从接收机返回的时钟信号与由发送方量子单元检测到的时钟信号之间的相位同步，并产生校准时钟信号。 在接收机中，接收机侧同步部分建立从经典信道检测的时钟信号与由接收机侧量子单元检测的时钟信号之间的相位同步，并产生校准时钟信号。

公开(公告)号：US08718485B2

公开(公告)日：2014-05-06

申请号：US12668919

申请日：2008-07-09

申请人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

发明人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

IPC分类号： G02B6/12

CPC分类号： H04L9/0858 ,  H04B10/548

摘要： In a quantum cryptographic transmitter (11), a phase modulator (1103, 1104) and an LN intensity modulator (1105) apply optical phase modulation and light intensity modulation to an optical signal based on desired data to generate a desired optical signal to be transmitted to a quantum cryptographic receiver (13). Based on the number of photons detected from the desired optical signal, a bias control circuit (1108) controls an operating point in light intensity modulation of the LN intensity modulator (1105).

摘要翻译： 在量子密码发射机（11）中，相位调制器（1103,1104）和LN强度调制器（1105）根据期望的数据向光信号应用光相位调制和光强调制，以产生要传输的所需光信号 到量子密码接收器（13）。 基于从期望的光信号检测到的光子的数量，偏置控制电路（1108）控制LN强度调制器（1105）的光强度调制中的工作点。

公开(公告)号：US08171354B2

公开(公告)日：2012-05-01

申请号：US13018486

申请日：2011-02-01

申请人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

发明人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

IPC分类号： G06F11/00 ,  G01R31/28

CPC分类号： H04L1/242 ,  H04L9/0858 ,  H04L2209/34

摘要： For an error rate QBER, threshold values are preset, including a threshold value Qbit for frame synchronization processing, a threshold value Qphase for phase correction processing, and a threshold value QEve for eavesdropping detection. Upon the distribution of a quantum key from a sender to a receiver, when the measurement value of QBER is deteriorated more than Qbit, frame synchronization processing is performed. When the measurement value of QBER is deteriorated more than Qphase, phase correction processing and frame synchronization processing are performed. When QBER does not become better than QEve even after these recovery-processing steps are repeated N times, it is determined that there is a possibility of eavesdropping, and the processing is stopped.

摘要翻译： 对于错误率QBER，预设阈值，包括帧同步处理的阈值Qbit，相位校正处理的阈值Qphase和用于窃听检测的阈值QEve。 当量子密钥从发送方分配到接收方时，当QBER的测量值恶化到比Qbit多的时候，执行帧同步处理。 当QBER的测量值劣于Qphase时，执行相位校正处理和帧同步处理。 即使在重复了N次这些恢复处理步骤之后，当QBER不比QEve变得更好时，确定存在窃听的可能性，并且停止处理。

公开(公告)号：US07974540B2

公开(公告)日：2011-07-05

申请号：US10581037

申请日：2004-11-29

申请人： Akihisa Tomita ,  Kazuo Nakamura ,  Akio Tajima ,  Akihiro Tanaka ,  Yoshihiro Nanbu ,  Shuuji Suzuki ,  Takeshi Takeuchi ,  Wakako Maeda ,  Seigo Takahashi

发明人： Akihisa Tomita ,  Kazuo Nakamura ,  Akio Tajima ,  Akihiro Tanaka ,  Yoshihiro Nanbu ,  Shuuji Suzuki ,  Takeshi Takeuchi ,  Wakako Maeda ,  Seigo Takahashi

IPC分类号： H04J14/06 ,  H04L9/00 ,  G02F1/01 ,  G02B5/30

CPC分类号： H04L9/0858

摘要： A communication system capable of employing polarization-dependent phase modulators with a reversing configuration that preserves security against disturbance of a polarization state at a transmission path but without using Faraday mirrors and a communication method using the same are provided.A quantum cryptography system of the present invention includes a first station 1, a transmission path 2, and a second station 3. The first station 1 has means for emitting time-divided optical pulses into the transmission path 2 and measuring a phase difference between the optical pulses returning from the transmission path 2. The transmission path 2 is a medium of light. The second station 3 has means for reversing traveling directions of the optical pulses, means for producing a phase difference, corresponding to a random number bit value to be transmitted, between the time-divided optical pulses, means for splitting the entering optical pulse into orthogonally polarized components and producing a 180-degree phase difference therebetween, means for rotating each polarization direction by 90 degrees, means for eliminating a component resulting from a deviation from the polarization rotation angle of 90 degrees, and means for attenuating optical pulse intensity to include no more than 1 photon per bit.

摘要翻译： 一种能够采用具有反转配置的偏振相关相位调制器的通信系统，其提供了防止在传输路径上的偏振状态的干扰的安全性，但是不使用法拉第镜和使用其的通信方法。 本发明的量子密码系统包括第一站1，传输路径2和第二站3.第一站1具有将时分光脉冲发射到传输路径2中的装置， 从传输路径2返回的光脉冲。传输路径2是光的介质。 第二站3具有用于反转光脉冲的行进方向的装置，用于在分时光脉冲之间产生与要发送的随机数位值相对应的相位差的装置，用于将进入的光脉冲分成正交的装置 偏振分量，并产生180度的相位差，使每个偏振方向旋转90度的装置，用于消除由偏振旋转角度90度偏差产生的分量的装置，以及用于衰减光脉冲强度的装置， 每位多于1个光子。

公开(公告)号：US20100195831A1

公开(公告)日：2010-08-05

申请号：US12668919

申请日：2008-07-09

申请人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

发明人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

IPC分类号： H04L9/08 ,  G02F1/01 ,  H04B10/04

CPC分类号： H04L9/0858 ,  H04B10/548

摘要： In a quantum cryptographic transmitter (11), a phase modulator (1103, 1104) and an LN intensity modulator (1105) apply optical phase modulation and light intensity modulation to an optical signal based on desired data to generate a desired optical signal to be transmitted to a quantum cryptographic receiver (13). Based on the number of photons detected from the desired optical signal, a bias control circuit (1108) controls an operating point in light intensity modulation of the LN intensity modulator (1105).

摘要翻译： 在量子密码发射机（11）中，相位调制器（1103,1104）和LN强度调制器（1105）根据期望的数据向光信号应用光相位调制和光强度调制，以产生要传输的所需光信号 到量子密码接收器（13）。 基于从期望的光信号检测到的光子的数量，偏置控制电路（1108）控制LN强度调制器（1105）的光强度调制中的工作点。

公开(公告)号：US07734757B2

公开(公告)日：2010-06-08

申请号：US12000471

申请日：2007-12-13

申请人： Wakako Maeda ,  Akio Tajima ,  Seigo Takahashi ,  Akihiro Tanaka

发明人： Wakako Maeda ,  Akio Tajima ,  Seigo Takahashi ,  Akihiro Tanaka

IPC分类号： G06F15/173

CPC分类号： H04L63/065 ,  H04L9/0858 ,  H04L63/0428 ,  H04L63/06

摘要： A method and system for allowing communication devices to synchronously manage shared information are provided. A sender sends single-photon pulses modulated with original random numbers to a receiver and also sends frame pulses by using ordinary optical pulses. Bit comparison and basis reconciliation are performed by the frame which is defined by the frame pulses, whereby sifted keys, which are aggregated as a file, are generated by the sender and the receiver individually. The sifted keys are subjected to error correction, privacy amplification, and file sharing processing by the file, whereby common cryptographic keys are synchronously stored in the sender and the receiver individually. The generated cryptographic keys are managed as encryption keys and decryption keys separately. A newly generated key is preferentially placed in the encryption keys or decryption keys that have a smaller stored amount.

摘要翻译： 提供了允许通信设备同步管理共享信息的方法和系统。 发送方发送用原始随机数调制的单光子脉冲到接收机，并且通过使用普通光脉冲发送帧脉冲。 比特比较和基础协调由帧脉冲定义的帧执行，由此发送者和接收者分别生成作为文件聚合的筛选的密钥。 筛选的密钥经过文件的纠错，隐私放大和文件共享处理，从而公共密码密钥被单独地同步地存储在发送器和接收器中。 生成的加密密钥分别作为加密密钥和解密密钥进行管理。 新产生的密钥优先放置在具有较小存储量的加密密钥或解密密钥中。

公开(公告)号：US20070098402A1

公开(公告)日：2007-05-03

申请号：US11589814

申请日：2006-10-31

申请人： Wakako Maeda ,  Akio Tajima ,  Akihiro Tanaka ,  Seigo Takahashi

发明人： Wakako Maeda ,  Akio Tajima ,  Akihiro Tanaka ,  Seigo Takahashi

IPC分类号： H04B10/08

CPC分类号： H04B10/66 ,  H04L9/0852

摘要： A method and apparatus for measuring the optical power of very weak light arriving at a receiver, by using a photon detector, are provided. A photon detector detects the presence or absence of the arrival of a photon in accordance with bias application timing. For a train of optical pulses coming in at an arbitrary timing in respective time slots, the bias application timing is sequentially shifted within the range of a time slot. Each time a shift is made, the number of photons detected is counted by a photon counter. Based on this number of photons, the optical power of the train of the optical pulses is measured.

摘要翻译： 提供了一种通过使用光子检测器来测量到达接收机的非常弱的光的光功率的方法和装置。 光子检测器根据偏置应用定时检测光子到达的存在或不存在。 对于在各个时隙中以任意定时进入的光脉冲序列，偏移施加定时在时隙的范围内顺序移位。 每次进行移位时，通过光子计数器对检测到的光子的数量进行计数。 基于该数量的光子，测量光脉冲列的光功率。

公开(公告)号：US08204231B2

公开(公告)日：2012-06-19

申请号：US12136419

申请日：2008-06-10

申请人： Wakako Maeda ,  Akio Tajima ,  Akihiro Tanaka ,  Seigo Takahashi

发明人： Wakako Maeda ,  Akio Tajima ,  Akihiro Tanaka ,  Seigo Takahashi

IPC分类号： H04L9/08

CPC分类号： H04L9/0855 ,  H04L9/083 ,  H04L9/0891

摘要： A cryptographic key management method and device are provided by which cryptographic keys of multiple nodes can be managed easily and stably. A system includes at least one first node and a plurality of second nodes connected to the first node, and the first node individually generates and consumes a cryptographic key with each of the second nodes connected to the first node itself. A cryptographic key management device in such a system has a monitor that monitors the stored key amounts of cryptographic keys of the individual second nodes, stored at the first node, and a key management control section that performs key generation control on the first node, based on the stored key amounts.

摘要翻译： 提供一种加密密钥管理方法和装置，可以容易且稳定地管理多个节点的加密密钥。 系统包括连接到第一节点的至少一个第一节点和多个第二节点，并且第一节点单独地生成并消耗加密密钥，其中每个第二节点连接到第一节点本身。 这种系统中的加密密钥管理装置具有监视器，该监视器监视存储在第一节点处的各个第二节点的密码密钥的存储密钥量，以及基于第一节点执行密钥生成控制的密钥管理控制部件 关于存储的关键金额。

公开(公告)号：US07934132B2

公开(公告)日：2011-04-26

申请号：US11482131

申请日：2006-07-07

申请人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

发明人： Akihiro Tanaka ,  Akio Tajima ,  Seigo Takahashi ,  Wakako Maeda

IPC分类号： G06F11/00 ,  G01R31/28 ,  H04B17/00 ,  H04L1/20

CPC分类号： H04L1/242 ,  H04L9/0858 ,  H04L2209/34

摘要： For an error rate QBER, threshold values are preset, including a threshold value Qbit for frame synchronization processing, a threshold value Qphase for phase correction processing, and a threshold value QEve for eavesdropping detection. Upon the distribution of a quantum key from a sender to a receiver, when the measurement value of QBER is deteriorated more than Qbit, frame synchronization processing is performed. When the measurement value of QBER is deteriorated more than Qphase, phase correction processing and frame synchronization processing are performed. When QBER does not become better than QEve even after these recovery-processing steps are repeated N times, it is determined that there is a possibility of eavesdropping, and the processing is stopped.

摘要翻译： 对于错误率QBER，预设阈值，包括帧同步处理的阈值Qbit，相位校正处理的阈值Qphase和用于窃听检测的阈值QEve。 当量子密钥从发送方分配到接收方时，当QBER的测量值恶化到比Qbit多的时候，执行帧同步处理。 当QBER的测量值劣于Qphase时，执行相位校正处理和帧同步处理。 即使在重复了N次这些恢复处理步骤之后，当QBER不比QEve变得更好时，确定存在窃听的可能性，并且停止处理。