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1. 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。

2. 发明申请

US20070110242A1 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：US20070110242A1
公开(公告)日：2007-05-17
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： H04K1/00 , G01J4/00 , G01B9/02 , G01J3/45
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。第一台1具有将时分光脉冲发射到传输路径2中并测量从传输路径2返回的光脉冲之间的相位差的装置。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。

3. 发明授权

US5351254A Semiconductor laser 失效
标题翻译：半导体激光器
公开(公告)号：US5351254A
公开(公告)日：1994-09-27
申请号：US982966
申请日：1992-11-30
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： H01S5/00 , H01S5/042 , H01S5/30 , H01S5/34 , H01S5/343 , H01S3/19
CPC分类号： B82Y20/00 , H01S5/34 , H01S5/3054 , H01S5/3407 , H01S5/3415 , H01S5/34306 , H01S5/34313
摘要： In order to provide a semiconductor laser with high differential gain and low nonlinear gain parameter and is capable of modulation at high speed, a p-type impurity is doped in a multi-quantum well barrier layer 151 which forms an active layer 15, and a spacer layer 152 undoped with impurity and thickness in the range of 2 to 4 nm is inserted between the barrier layer and a well layer 153. By setting the thickness of the spacer layer 152 in the above-mentioned range, the wave function of the electron leaks to the barrier layer 151 beyond the spacer layer 152, whereas the wave function of the hole is localized in the well layer 153 and does not leak to the barrier layer 151. Therefore, electrons alone are scattered and their intraband relaxation time is reduced. Since the intra-band relaxation time of the hole does not change, the nonlinear gain parameter alone is reduced while maintaining the differential gain at a high value, and the maximum modulation frequency can be increased.
摘要翻译：为了提供具有高差分增益和低非线性增益参数的半导体激光器，并且能够高速调制，在形成有源层15的多量子阱势垒层151中掺杂p型杂质，并且未掺杂杂质的间隔层152和2〜4nm范围内的厚度被插入在阻挡层和阱层153之间。通过将间隔层152的厚度设定在上述范围内，电子的波函数泄漏到隔离层152之外的阻挡层151，而孔的波函数定位在阱层153中，并且不泄漏到阻挡层151.因此，单独的电子被散射并且其内部的弛豫时间减少。由于孔的带内弛豫时间没有变化，所以单独的非线性增益参数减小，同时将差分增益保持在高值，并且可以增加最大调制频率。

4. 发明授权

US6014394A Semiconductor laser 失效
标题翻译：半导体激光器
公开(公告)号：US6014394A
公开(公告)日：2000-01-11
申请号：US934888
申请日：1997-09-22
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： H01S5/00 , H01S5/065 , H01S5/20 , H01S5/223 , H01S5/323 , H01S3/19 , H01S3/10
CPC分类号： H01S5/20 , H01S5/0658 , H01S5/2009 , H01S5/2231
摘要： A semiconductor laser is provided having excellent characteristics such as long life, less variable threshold current due to the temperature change, and low noise, by effectively preventing leakage of electrons from the active layer. The semiconductor laser is provided with a electron barrier layer and the guide layer of the laser is doped with an n-type dopant, such that a high electron barrier is constructed between the guide layer and the cladding layer.
摘要翻译：通过有效地防止电子从活性层的泄漏，提供半导体激光器具有优异的特性，例如长寿命，由于温度变化导致的可变阈值电流和低噪声。半导体激光器设置有电子势垒层，并且激光器的引导层掺杂有n型掺杂剂，使得在引导层和包层之间构造高电子势垒。

5. 发明授权

US5559820A Multiple quantum well semiconductor laser 失效
标题翻译：多量子阱半导体激光器
公开(公告)号：US5559820A
公开(公告)日：1996-09-24
申请号：US499661
申请日：1995-07-07
申请人： Akitaka Kimura , Masaaki Nido , Akihisa Tomita , Akira Suzuki
发明人： Akitaka Kimura , Masaaki Nido , Akihisa Tomita , Akira Suzuki
IPC分类号： H01S5/00 , H01S5/042 , H01S5/183 , H01S5/22 , H01S5/227 , H01S5/32 , H01S5/34 , H01S3/19
CPC分类号： B82Y20/00 , H01S5/2275 , H01S5/0424 , H01S5/2205 , H01S5/3211 , H01S5/3415 , H01S5/3428
摘要： A stripe structure including an MQW active layer has a width equal to or smaller than twice the diffusion length of holes, and a p type semiconductor layer for injecting holes into the MQW active layer is formed on both sides of the stripe structure in contact with the sides of the stripe structure. Even when any MQW structure is used as the MQW active layer in order to reduce the temperature dependency of the threshold current, holes are injected into QW layers from the p type semiconductor layer which is in direct contact with all the QW layers in the MQW active layer, so that no local presence of holes in some QW layers occurs. Since the width of the stripe structure is equal to or smaller than twice the diffusion length of holes, the holes are uniformly injected in the direction parallel to the QW surface. That is, it is possible to improve the MQW active layer, while avoiding the local presence of holes, to reduce the temperature dependency of the threshold current which is accompanied with the local presence of holes in the conventional structure. This structure can reduce the temperature dependency of the threshold current of a semiconductor laser.
摘要翻译：包括MQW有源层的条纹结构的宽度等于或小于孔的扩散长度的两倍，并且用于将空穴注入MQW有源层的ap型半导体层形成在条形结构的与侧面接触的两侧的条纹结构。即使使用任何MQW结构作为MQW有源层，为了降低阈值电流的温度依赖性，也可以将空穴从与MQW有源的所有QW层直接接触的p型半导体层注入QW层层，使得在一些QW层中不存在空穴的局部存在。由于条形结构的宽度等于或小于孔的扩散长度的两倍，所以孔在平行于QW表面的方向上被均匀地注入。也就是说，可以改善MQW有源层，同时避免空穴的局部存在，以降低伴随常规结构中局部存在孔的阈值电流的温度依赖性。该结构可以降低半导体激光器的阈值电流的温度依赖性。

6. 发明授权

US07583438B2 Quantum circuit and quantum computer 失效
标题翻译：量子电路和量子计算机
公开(公告)号：US07583438B2
公开(公告)日：2009-09-01
申请号：US10526047
申请日：2002-10-02
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： G02B5/30
CPC分类号： G06N99/002 , B82Y10/00 , Y10S977/94
摘要： A quantum circuit and a quantum computer are capable of performing multi-bit quantum computation. In the quantum circuit, a quantum bit is represented by polarization directions of light, a sequence of polarized light pulses representing a quantum bit string is sequentially supplied to the quantum circuit, and an amount of polarization rotation and phase difference applied to a certain light pulse are determined on the basis of a result of a polarization measurement of a preceding input light pulse sequence, thus realizing a controlled-unitary transform. In addition, regarding the light pulses representing the quantum bits, the number of photons included in one pulse is larger than 1, resulting in a reduction of the influence of error.
摘要翻译：量子电路和量子计算机能够执行多位量子计算。在量子电路中，量子比特由光的偏振方向表示，表示量子比特串的偏振光脉冲序列依次提供给量子电路，并且施加于某个光脉冲的极化旋转和相位差的量是基于前面的输入光脉冲序列的偏振测量的结果确定的，从而实现受控整体变换。此外，对于表示量子比特的光脉冲，包括在一个脉冲中的光子数大于1，导致误差的影响减小。

7. 发明授权

US5859865A Semiconductor laser 失效
标题翻译：半导体激光器
公开(公告)号：US5859865A
公开(公告)日：1999-01-12
申请号：US823040
申请日：1997-03-21
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： H01S5/00 , H01S5/343 , H01S3/19
CPC分类号： B82Y20/00 , H01S5/34326
摘要： A semiconductor laser includes a substrate and an active layer. The substrate has a lattice constant which falls within the range between 0.565 nm and 0.56 nm. The active layer has a quantum well structure in which a GaInP alloy crystal with a lattice constant larger than the lattice constant of the substrate is formed as a well layer and an AlGaInP alloy crystal with a lattice constant smaller than the lattice constant of the substrate is formed as a barrier layer.
摘要翻译：半导体激光器包括衬底和有源层。基板的晶格常数落在0.565nm和0.56nm之间的范围内。活性层具有量子阱结构，其中形成晶格常数大于衬底晶格常数的GaInP合金晶体作为阱层，晶格常数小于衬底晶格常数的AlGaInP合金晶体是形成阻挡层。

8. 发明申请

US20060208311A1 Quantum circuit and quantum computer 失效
标题翻译：量子电路和量子计算机
公开(公告)号：US20060208311A1
公开(公告)日：2006-09-21
申请号：US10526047
申请日：2002-10-02
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： H01L29/788
CPC分类号： G06N99/002 , B82Y10/00 , Y10S977/94
摘要： The present invention realizes a quantum circuit and a quantum computer capable of performing multi-bit quantum computation. A quantum bit is represented by the polarization directions of light, a sequence of polarized light pulses representing a quantum bit string is sequentially supplied, and the amount of polarization rotation applied to a certain light pulse and the amount of phase difference are determined on the basis of a result of the measurement of polarization of the preceding input light pulse sequence, thus realizing a controlled-unitary transform. In addition, regarding the light pulses representing the quantum bits, the number of photons included in one pulse is larger than 1, resulting in a reduction of the influence of error.
摘要翻译：本发明实现了能够执行多位量子计算的量子电路和量子计算机。量子比特由光的偏振方向表示，顺序提供表示量子比特串的偏振光脉冲序列，并且基于该基准确定施加于特定光脉冲的极化旋转量和相位差量是前面的输入光脉冲序列的偏振测量结果，从而实现了受控整体变换。此外，对于表示量子比特的光脉冲，包括在一个脉冲中的光子数大于1，导致误差的影响减小。

9. 发明授权

US06665486B2 Single photon generating apparatus 失效
标题翻译：单光子发生装置
公开(公告)号：US06665486B2
公开(公告)日：2003-12-16
申请号：US09780694
申请日：2001-02-14
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： G02B600
CPC分类号： B82Y20/00 , G02B6/1225 , Y10S977/834 , Y10S977/949
摘要： A single photon generating apparatus includes an optical waveguide, an active medium section and a resonator section. In the active medium section, a single electron is excited in response to application of exciting energy, and a single photon is emitted from the electron. The resonator section optically resonates with the active medium section, holds the photon emitted from the electron in the resonator, and transfers the held photon to the optical waveguide in response to a first control signal.
摘要翻译：单光子发生装置包括光波导，有源介质部分和谐振器部分。在有源介质部分中，响应于激发能量的应用激发单个电子，并且从电子发射单个光子。谐振器部分与有源介质部分光学谐振，保持在谐振器中从电子发出的光子，并且响应于第一控制信号将保持的光子传送到光波导。

10. 发明授权

US06444999B1 Quantum circuit 失效
标题翻译：量子电路
公开(公告)号：US06444999B1
公开(公告)日：2002-09-03
申请号：US09917759
申请日：2001-07-31
申请人： Akihisa Tomita
发明人： Akihisa Tomita
IPC分类号： H01L2906
CPC分类号： H04B10/70 , H04L9/0858
摘要： With the object of providing a practical quantum circuit capable of discriminating Bell states in order to realize transmission of quantum states with high fidelity, a quantum circuit comprises: a two-photon absorbing crystal that selectively absorbs, in accordance with known selection rules, a photon pair of a Bell state that is determined depending on crystal symmetry of said two-photon absorbing crystal; a two-photon absorption detector that detects absorption of photon pairs by said two-photon absorbing crystal; and a polarization element that converts the Bell state of a polarized photon pair. The two-photon absorbing crystal makes two-photon absorption of a photon pair of a specific Bell state only. Electrons that have been excited by the two-photon absorption are detected by the detector.
摘要翻译：为了提供能够区分贝尔状态以实现高保真度的量子态传输的实际量子电路，其目的是量子电路包括：双光子吸收晶体，其根据已知的选择规则选择性地吸收光子一对贝尔状态，其取决于所述双光子吸收晶体的晶体对称性; 双光子吸收检测器，其通过所述双光子吸收晶体检测光子对的吸收; 以及转换偏振光子对的Bell状态的偏振元件。双光子吸收晶体使得仅具有特定贝尔状态的光子对的双光子吸收。由双光子吸收激发的电子被检测器检测。

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