公开(公告)号：US20070230688A1

公开(公告)日：2007-10-04

申请号：US11505814

申请日：2006-08-18

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

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

IPC分类号： H04L9/30

CPC分类号： H04L9/0858 ,  H04B10/70 ,  H04L9/0891

摘要： A user request can be reflected in the degree of security of an updated key in quantum key distribution. A sender and a receiver are connected through optical fiber. A quantum transmitter in the sender and a quantum receiver in the receiver carry out basis reconciliation and error correction through a quantum channel, based on a source of a key sent from the quantum transmitter and on a raw key received by the quantum receiver. Under the control of security control sections in the sender and receiver, the amount of information with the possibility of being intercepted that is determined in accordance with a degree of security requested by a user, is removed from the key information after error correction, whereby a final cryptographic key is generated. Secret communication is performed between encryption/decryption sections in the sender and receiver by using the cryptographic key thus updated.

摘要翻译： 用户请求可以反映在量子密钥分发中更新密钥的安全程度。 发送器和接收器通过光纤连接。 发送器中的量子发射器和接收器中的量子接收器通过量子通道基于从量子发射器发送的密钥的源和由量子接收器接收的原始密钥来执行基础协调和纠错。 在发送方和接收方的安全控制部分的控制下，根据用户要求的安全程度确定可能被拦截的信息量在纠错后从密钥信息中移除，由此 生成最终加密密钥。 通过使用由此更新的加密密钥在发送方和接收方的加密/解密部分之间执行秘密通信。

公开(公告)号：US20070009098A1

公开(公告)日：2007-01-11

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： H04L9/30

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，阈值被预设，包括用于帧同步处理的阈值Q SUB位，用于相位校正处理的阈值Q相位＆lt; / SUB＆gt;和阈值 Q 用于窃听检测。 当量子密钥从发送器分配到接收器时，当QBER的测量值劣化到大于Q 时，执行帧同步处理。 当QBER的测量值劣化到大于Q相位时，执行相位校正处理和帧同步处理。 即使在这些恢复处理步骤重复N次之后，当QBER不比Q 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：US09160529B2

公开(公告)日：2015-10-13

申请号：US11505814

申请日：2006-08-18

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

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

IPC分类号： H04L9/08 ,  H04B10/70

CPC分类号： H04L9/0858 ,  H04B10/70 ,  H04L9/0891

摘要： A user request can be reflected in the degree of security of an updated key in quantum key distribution. A sender and a receiver are connected through optical fiber. A quantum transmitter in the sender and a quantum receiver in the receiver carry out basis reconciliation and error correction through a quantum channel, based on a source of a key sent from the quantum transmitter and on a raw key received by the quantum receiver. Under the control of security control sections in the sender and receiver, the amount of information having the possibility of being intercepted, which is determined in accordance with a degree of security requested by a user, is removed from the key information after error correction, whereby a final cryptographic key is generated. Secret communication is performed between encryption/decryption sections in the sender and receiver by using the cryptographic key thus updated.

摘要翻译： 用户请求可以反映在量子密钥分发中更新密钥的安全程度。 发送器和接收器通过光纤连接。 发送器中的量子发射器和接收器中的量子接收器通过量子信道基于从量子发射器发送的密钥的源和由量子接收器接收的原始密钥来执行基础协调和纠错。 在发送方和接收方的安全控制部分的控制下，根据用户要求的安全程度确定可能被拦截的信息量在纠错后从密钥信息中移除，由此 生成最终加密密钥。 通过使用由此更新的加密密钥在发送方和接收方的加密/解密部分之间执行秘密通信。

公开(公告)号：US08949300B2

公开(公告)日：2015-02-03

申请号：US11621872

申请日：2007-01-10

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： G06F1/02 ,  G06F7/58 ,  H04K1/00 ,  H04L9/08

CPC分类号： H04L9/0852 ,  G06F7/58 ,  H04L9/0838

摘要： A random number quality control circuit capable of fast control of the level of random number quality is present. When a “0” output section and a “1” output section generate random numbers by individually receiving a random number signal, a random number quality monitor monitors an unbalance between the numbers of “0”s and “1”s. If a deviation from a desired ratio is found, a drive controller controls the reception characteristics of the “0” output section and “1” output section individually so that the deviation will be compensated for. The amount of information intercepted between a sender and a receiver can be reduced by maintaining the mark ratio of shared random numbers at 50%.

摘要翻译： 存在能够快速控制随机数质量水平的随机数质量控制电路。 当“0”输出部分和“1”输出部分通过分别接收随机数信号产生随机数时，随机数质量监视器监视“0”和“1”之间的不平衡。 如果发现与期望比率的偏差，则驱动控制器分别控制“0”输出部分和“1”输出部分的接收特性，以便补偿偏差。 通过将共享随机数的标记比维持在50％，可以减少发送方和接收方之间拦截的信息量。

公开(公告)号：US08638942B2

公开(公告)日：2014-01-28

申请号：US12385832

申请日：2009-04-21

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： H04L29/00

CPC分类号： H04L9/0855 ,  H04L9/083

摘要： A method for managing shared random numbers in a secret communication network including at least one center node and a plurality of remote nodes connected to the center node, includes: sharing random number sequences between the center node and respective ones of the plurality of remote nodes; when performing random numbers sharing between a first remote node storing a first random number sequence shared with the center node and a second remote node storing a second random number sequence shared with the center node, distributing a part of the second random number sequence from the center node to the first remote node; and sharing the part of the second random number sequence between the first remote node and the second remote node.

摘要翻译： 一种用于在包括至少一个中心节点和连接到中心节点的多个远程节点的秘密通信网络中管理共享随机数的方法，包括：在所述中心节点和所述多个远程节点中的相应节点之间共享随机数序列; 当在存储与中心节点共享的第一随机数序列的第一远程节点和存储与中心节点共享的第二随机数序列的第二远程节点之间执行随机数共享时，从中心分配第二随机数序列的一部分 节点到第一个远程节点; 并且在第一远程节点和第二远程节点之间共享第二随机数序列的部分。

公开(公告)号：US08184989B2

公开(公告)日：2012-05-22

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。

公开(公告)号：US08041232B2

公开(公告)日：2011-10-18

申请号：US12190923

申请日：2008-08-13

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： H04B10/04

CPC分类号： H04B10/5051 ,  H04B10/5053 ,  H04B10/541 ,  H04B10/548

摘要： An optical transmitter which modulates the phases and intensities of double pulses and then transmits them, includes a branching section which branches each of the input double pulses to first and second paths, a first optical modulator placed in the first path, second and third optical modulators placed in series in the second path, and a combining section which combines the double pulses having traveled through the first path with the double pulses having traveled through the second path to output double pulses. A control section controls such that each of the first and second optical modulators performs any one of relative intensity modulation and relative phase modulation on the double pulses passing through, and the third optical modulator performs relative phase modulation on the double pulses passing through.

摘要翻译： 调制双脉冲的相位和强度然后传输它们的光发射器包括分支部分，其将每个输入双脉冲分支到第一和第二路径，放置在第一路径中的第一光调制器，第二和第三光调制器 串联放置在第二路径中，以及组合部分，其将通过第一路径行进的双脉冲与已经穿过第二路径的双脉冲组合以输出双脉冲。 控制部分控制使得第一和第二光学调制器中的每一个对通过的双脉冲执行相对强度调制和相对相位调制中的任何一个，并且第三光调制器对通过的双脉冲执行相对相位调制。

公开(公告)号：US08009984B2

公开(公告)日：2011-08-30

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： H04B17/00 ,  H04B10/08 ,  H04B10/12 ,  H04L9/08 ,  H01S3/00

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：US07907850B2

公开(公告)日：2011-03-15

申请号：US11788707

申请日：2007-04-20

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： H04B10/00

CPC分类号： H04B10/5051 ,  H04B10/505 ,  H04B10/54 ,  H04B10/548 ,  H04B10/70 ,  H04L9/0858

摘要： An optical communication apparatus that can perform stable intensity and phase modulation on an optical pulse at high speed is provided, as well as a quantum key distribution system using the apparatus. Using multilevel signals for the electric signals (RF1, RF2) to be applied to two arms of a two-electrode Mach-Zehnder modulator, phase modulation is performed on an optical pulse in accordance with the average of the levels of the signals (RF1, RF2), and intensity modulation is performed on the optical pulse in accordance with the voltage difference between the signals (RF1, RF2), whereby stable high-speed multilevel modulation can be realized. The cryptographic key generation rate in a decoy quantum key distribution system is enhanced.

摘要翻译： 提供了可以对光脉冲高速执行稳定的强度和相位调制的光通信装置，以及使用该装置的量子密钥分发系统。 使用多电平信号将电信号（RF1，RF2）施加到两电极马赫 - 曾德调制器的两个臂，根据信号电平（RF1，RF1，RF2）的平均值对光脉冲进行相位调制， RF2），并且根据信号（RF1，RF2）之间的电压差对光脉冲进行强度调制，从而可以实现稳定的高速多电平调制。 诱饵量子密钥分发系统中的加密密钥产生速率得到提高。

公开(公告)号：US07783042B2

公开(公告)日：2010-08-24

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： H04L9/00 ,  H04L9/08 ,  H04B17/00 ,  H03L7/197 ,  H01Q3/26

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。