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11. 发明申请

US20070110454A1 Communication system and timing control method 有权
标题翻译：通讯系统及时序控制方法
公开(公告)号：US20070110454A1
公开(公告)日：2007-05-17
申请号：US11471876
申请日：2006-06-21
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： H04B10/04
CPC分类号： H04L9/0852 , H04B10/548
摘要： A communication system and a timing control method are proposed that optimize timing in a sender and thereby enable information to be stably transmitted at the right timing. Under instructions from a timing controller in a receiver, the timing of driving a phase modulator in a sender is shifted by one step after another, and the then amount of clock shift and result of interference are monitored at the receiver and stored in a memory. The optimum timing is determined based on the stored data. Thus, a clock for driving the phase modulator in the sender can be set at the right timing. This is equivalent to compensating for group velocity dispersion due to wavelength dispersion that occurs when an optical signal channel and a clock signal channel are transmitted by wavelength division multiplexing transmission.
摘要翻译：提出一种通信系统和定时控制方法，其优化发送方的定时，从而使信息能够在正确的时机稳定地发送。在来自接收机中的定时控制器的指令下，将发送器中的相位调制器驱动的定时一个接一个地移位，然后在接收器处监视时钟偏移量和干扰结果，并将其存储在存储器中。基于所存储的数据确定最佳定时。因此，可以在正确的时机设置用于驱动发送器中的相位调制器的时钟。这相当于补偿当通过波分复用传输发送光信号通道和时钟信号通道时发生的由于波长色散引起的群速度色散。

12. 发明授权

US08718485B2 Quantum key distribution system, optical transmitter, optical modulation control circuit, and optical modulation control method 有权
标题翻译：量子密钥分发系统，光发射机，光调制控制电路和光调制控制方法
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。

13. 发明授权

US08171354B2 Communication system and method for controlling the same 有权
标题翻译：通信系统及其控制方法
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。

14. 发明授权

US07974540B2 Communication system and communication method using the same 有权
标题翻译：通信系统和通信方法使用相同
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。

15. 发明申请

US20100195831A1 QUANTUM KEY DISTRIBUTION SYSTEM, OPTICAL TRANSMITTER, OPTICAL MODULATION CONTROL CIRCUIT, AND OPTICAL MODULATION CONTROL METHOD 有权
标题翻译：量子钥匙分配系统，光发射机，光调制控制电路和光调制控制方法
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。

16. 发明授权

US07734757B2 Method and system for managing shared information 有权
标题翻译：管理共享信息的方法和系统
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。

17. 发明授权

US07616765B2 Method and system for generating shared information 有权
标题翻译：生成共享信息的方法和系统
公开(公告)号：US07616765B2
公开(公告)日：2009-11-10
申请号：US11261669
申请日：2005-10-31
申请人： Wakako Maeda , Akio Tajima , Akihiro Tanaka
发明人： Wakako Maeda , Akio Tajima , Akihiro Tanaka
IPC分类号： H04K1/00 , H04L9/00
CPC分类号： H04L9/0852 , H04L2209/34
摘要： A sender sends original random-number data to a receiver through a quantum channel. The receiver generates a raw key from information received through the quantum channel and notifies the received information to the sender. The sender performs received-bit comparison and basis reconciliation based on the received information and provisionally shares a sifted key with the receiver. The receiver sends part of its version of the sifted key to the sender, by which an error rate is calculated. The calculated error rate is compared with a predetermined threshold value for bit position synchronization determination. When the calculated error rate is larger, the sender notifies the receiver that bit position synchronization is not established. The receiver reassigns bit numbers to the sifted key, and received-bit comparison and basis reconciliation are performed again. This procedure is repeated until the calculated error rate becomes smaller than the threshold value.
摘要翻译：发送者通过量子信道向接收者发送原始随机数数据。接收机通过量子信道接收到的信息生成原始密钥，并将接收到的信息通知发送方。发送者根据接收到的信息执行接收比特比较和基础协调，并临时与接收者共享筛选密钥。接收方将其筛选密钥的一部分版本发送给发送方，由此计算错误率。计算的误差率与用于位位置同步确定的预定阈值进行比较。当计算出的错误率较大时，发送方通知接收端位位置同步不成立。接收器将位号重新分配到筛选的密钥，并且再次执行接收比特比较和基础协调。重复该过程，直到计算的误差率变得小于阈值。

18. 发明授权

US07613396B2 Multiplexing communication system and crosstalk elimination method 有权
标题翻译：多路复用通信系统和串扰消除方法
公开(公告)号：US07613396B2
公开(公告)日：2009-11-03
申请号：US11217319
申请日：2005-09-02
申请人： Wakako Maeda , Akio Tajima , Akihiro Tanaka
发明人： Wakako Maeda , Akio Tajima , Akihiro Tanaka
IPC分类号： H04J14/02 , H04B10/12
CPC分类号： H04B10/70
摘要： In a system where a quantum channel and a classical channel are multiplexed on a single optical transmission line and information is transmitted from a transmitter to a receiver through the quantum channel, the classical channel is inhibited from affecting the quantum channel. To this end, the transmission characteristics of a transmitter-side wavelength multiplexer/demultiplexer for the classical channel, the transmission characteristics of a receiver-side wavelength multiplexer/demultiplexer for the quantum channel, and the optical power of a light source for the classical channel are designed so that crosstalk light due to spontaneous emission light and crosstalk light due to nonlinear optical effects can be suppressed, and the classical channel does not affect the quantum channel.
摘要翻译：在量子信道和经典信道被复用在单个光传输线上并且信息通过量子信道从发射机发射到接收机的系统中，禁止经典信道影响量子信道。为此，用于经典信道的发射机侧波长多路复用器/解复用器的传输特性，用于量子信道的接收机侧波长多路复用器/解复用器的传输特性以及用于经典信道的光源的光功率被设计成可以抑制由于非线性光学效应引起的自发发射光和串扰光的串扰光，并且经典通道不影响量子通道。

19. 发明授权

US07580634B2 Transmission method, transmitter-receiver, and transmitting-receiving system 有权
标题翻译：传输方式，发射机和发射接收系统
公开(公告)号：US07580634B2
公开(公告)日：2009-08-25
申请号：US10971047
申请日：2004-10-25
申请人： Takeshi Takeuchi , Akio Tajima , Shigekazu Harada , Akihiro Tanaka , Wakako Maeda
发明人： Takeshi Takeuchi , Akio Tajima , Shigekazu Harada , Akihiro Tanaka , Wakako Maeda
IPC分类号： H04B10/08
CPC分类号： H04B10/077 , H04B10/07955
摘要： A transmitter-receiver having a means for automatically determining the status of transmission medium such as optical fiber, and a means for automatically setting and resetting the transmission rate and/or output power according to the status of the transmission medium, a transmission loss and gain measurement method, and a transmitting-receiving system. A transmitter-receiver comprises at least: an output power controller for controlling the output power of a transmitter; an input power measuring section for measuring the strength of input signals; and an information processor for deriving the loss or gain of a path to change the output power of the transmitter and/or the rate of data transmission according to the derived loss or gain of the path. A transmission loss and gain measurement method applied to a system comprising transmission media and a plurality of the transmitter-receivers connected via the transmission media, comprises the steps of: transmitting information on the output power of a first transmitter-receiver from the first transmitter-receiver to a second transmitter-receiver; measuring reception strength by the second transmitter-receiver when the second transmitter-receiver receives the output power information; reading the output power information by the second transmitter-receiver; and comparing the reception strength with the output power information to calculate a transmission loss or gain by the second transmitter-receiver.
摘要翻译：具有用于自动确定诸如光纤的传输介质的状态的装置的发射机 - 接收机，以及根据传输介质的状态自动设置和重置传输速率和/或输出功率的装置，传输损耗和增益测量方法和发送接收系统。发射机 - 接收机至少包括：用于控制发射机的输出功率的输出功率控制器; 用于测量输入信号的强度的输入功率测量部分; 以及信息处理器，用于根据导出的路径损失或增益导出用于改变发射机的输出功率的路径的损失或增益和/或数据传输速率。一种应用于包括通过传输介质连接的传输介质和多个发射机 - 接收机的系统的传输损耗和增益测量方法包括以下步骤：从第一发射机 - 接收机发送关于第一发射机 - 接收机的输出功率的信息，接收机到第二发射机 - 接收机; 当第二发射机 - 接收机接收到输出功率信息时，测量第二发射机 - 接收机的接收强度; 通过第二发射机 - 接收机读取输出功率信息; 以及将接收强度与输出功率信息进行比较，以计算第二发射机 - 接收机的传输损耗或增益。

20. 发明申请

US20070098402A1 Method and apparatus for measuring optical power of very weak light, and optical communication system using the same 有权
标题翻译：用于测量非常弱的光的光功率的方法和装置，以及使用该光学通信系统的光通信系统
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。

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