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    Quantum entanglement photon-pair producing device and quantum entanglement photon pair producing method
    5.
    发明授权
    Quantum entanglement photon-pair producing device and quantum entanglement photon pair producing method 失效
    量子纠缠光子对产生装置和量子纠缠光子对的产生方法

    公开(公告)号：US07570419B2

    公开(公告)日：2009-08-04

    申请号：US12224289

    申请日：2007-03-01

    申请人： Keiichi Edamatsu ,  Ryosuke Shimizu

    发明人： Keiichi Edamatsu ,  Ryosuke Shimizu

    IPC分类号： G02F1/35 ,  H04L9/00

    CPC分类号： G02F1/39 ,  B82Y10/00 ,  G06N99/002

    摘要： In one embodiment of the present invention, a quantum entangled photon-pair producing device is disclosed which includes a superposed state generating device for generating a superposed state of photon-pairs entering through N (N≧2) different incident optical paths and being composed of photons having different polarization directions, and a light-guide device for separating the photon-pairs entering through the N (e.g. N is two) incident optical paths into photons having a first polarization direction (e.g. horizontally polarized light) and those having a second polarization direction (e.g. vertically polarized light) and guiding the photons having the first polarization direction and entering through the i-th (1≦i≦N) (e.g. the first) incident optical path and photons having the second polarization direction and entering through the (N−i+1) (e.g. the second) incident optical path to the i-th (e.g. the first) exit optical path through optical paths having the same optical path length. Therefore, quantum entangled photons of N channels having a quantum correlation with regard to the polarization direction can be produced. With this, a quantum entangled photon-pair producing device capable of producing quantum entangled photon-pairs of multi-channel having a quantum correlation with regard to the polarization direction with high production efficiency is realized.

    摘要翻译： 在本发明的一个实施例中，公开了一种量子纠缠光子对产生装置，其包括用于产生通过N（N> = 2）个不同入射光路进入的光子对的叠加状态的叠加状态产生装置， 的光子具有不同的偏振方向，以及导光装置，用于将通过N（例如N是两个）入射的光子对分离成具有第一偏振方向（例如水平偏振光）的光子，并且具有第二偏振方向的光子 偏振方向（例如垂直偏振光），并引导具有第一偏振方向的光子并通过第i（1≤i≤N）（例如第一）入射光路和具有第二偏振方向的光子进入 通过具有相同光路径的光路的第（N-i + 1）（例如第二）入射光路到第i（例如第一）出射光路 H。 因此，可以产生与偏振方向有量子相关性的N个通道的量子纠缠光子。 由此，实现了能够以高生产效率产生与极化方向有量子相关性的多通道量子纠缠光子对的量子纠缠光子对产生装置。

    Head position recognition method, a speed calculation method, and a head movement speed control device
    6.
    发明授权
    Head position recognition method, a speed calculation method, and a head movement speed control device 失效
    头部位置识别方法，速度计算方法和头部移动速度控制装置

    公开(公告)号：US5383068A

    公开(公告)日：1995-01-17

    申请号：US883209

    申请日：1992-05-14

    申请人： Ryosuke Shimizu ,  Tetsurou Takaoka

    发明人： Ryosuke Shimizu ,  Tetsurou Takaoka

    IPC分类号： G11B5/55 ,  G11B21/08 ,  G11B5/596 ,  G11B7/00

    CPC分类号： G11B5/5547 ,  G11B21/083

    摘要： A head position recognition method, a speed calculation method, and a head movement speed control device which provide for an overall improvement in storage device performance without increasing the seek time of the data head. Discrete servo sectors are provided circumferentially to the recording medium, four servo patterns with a minimum repeat cycle of 24 tracks are written into each servo sector. The range of the head seek distance that should be obtained at the current servo sector is estimated based on the previously calculated head seek distance, and the calculated head seek speed is corrected to the true head seek distance.

    摘要翻译： 一种头位置识别方法，速度计算方法以及头部移动速度控制装置，其在不增加数据头的寻道时间的情况下提供存储装置性能的总体改进。 离散伺服扇区周向地设置在记录介质上，具有24个轨迹的最小重复周期的四个伺服模式被写入每个伺服扇区。 基于先前计算的头部搜索距离来估计在当前伺服扇区处应该获得的头部搜索距离的范围，并将所计算的头部寻道速度校正为真正的头部搜索距离。

    GENERATOR OF POLARIZATION ENTANGLED PHOTON PAIRS AND METHOD OF GENERATING THE SAME
    8.
    发明申请
    GENERATOR OF POLARIZATION ENTANGLED PHOTON PAIRS AND METHOD OF GENERATING THE SAME 有权
    偏振光子对发生器及其生成方法

    公开(公告)号：US20120134377A1

    公开(公告)日：2012-05-31

    申请号：US13376107

    申请日：2010-06-03

    申请人： Ryosuke Shimizu ,  Keiichi Edamatsu

    发明人： Ryosuke Shimizu ,  Keiichi Edamatsu

    IPC分类号： H01S3/10

    CPC分类号： H04B10/70 ,  G02F1/35 ,  G02F2202/20 ,  H04J14/02 ,  H04L9/0858

    摘要： A wavelength-multiplexed polarization entangled photon pair generator (1) includes: a pump light source (2); a polarization entangled photon pair generating body (4) on which pump light (3) outputted from the pump light source (2) falls; and a spectrometer (7) on which a wavelength-multiplexed parametric photon pair (5) outputted from the polarization entangled photon pair generating body 4 falls. The polarization entangled photon pair generating body (4) made of a nonlinear optical crystal (11) generates wavelength-multiplexed photon pairs by subjecting the pump light 3 to type II phase matching. As a nonlinear optical crystal 11, lithium tantalate of periodically poled structure (11A) can be used, and as a spectrometer (7), an arrayed-waveguide grating can be used. Wavelength-multiplexed polarization entangled photon pairs (5) can thus be generated with simple equipment.

    摘要翻译： 波长多路复用偏振纠缠光子对发生器（1）包括：泵浦光源（2）; 偏振纠缠光子对发生体（4），泵浦光源（2）输出的泵浦光（3）落在其上; 以及从偏振纠缠光子对产生体4输出的波长多路复用参数光子对（5）的光谱仪（7）。 由非线性光学晶体（11）制成的偏振纠缠光子对产生体（4）通过对泵浦光3进行II型相位匹配来产生波长多路复用的光子对。 作为非线性光学晶体11，可以使用周期性极化结构（11A）的钽酸锂，作为光谱仪（7），可以使用阵列波导光栅。 波分复用偏振纠缠光子对（5）可以用简单的设备生成。

    Optical nonliner evaluation device and optical switching element
    9.
    发明授权
    Optical nonliner evaluation device and optical switching element 失效
    光学非线性评估装置和光开关元件

    公开(公告)号：US07652770B2

    公开(公告)日：2010-01-26

    申请号：US11990627

    申请日：2006-12-06

    申请人： Keiichi Edamatsu ,  Ryosuke Shimizu ,  Nobuyuki Matsuda

    发明人： Keiichi Edamatsu ,  Ryosuke Shimizu ,  Nobuyuki Matsuda

    IPC分类号： G01B9/02 ,  G01N21/00 ,  H04B10/00

    CPC分类号： G02F1/3511 ,  G01J9/02 ,  G02F1/3519

    摘要： An optical nonlinear evaluation device (1) capable of accurately evaluating the optical nonlinearity of a Kerr medium in accordance with a phase difference caused by cross-phase modulation generated in the Kerr medium includes: a polarization Sagnac interference path (3) provided with a Kerr medium (4); an optical pulse light source (7) for supplying a signal beam (Dsig); a polarization beam splitter (PBS1) for splitting the signal beam (Dsig) into a signal beam (Hsig) and a signal beam (Vsig) polarized in a direction orthogonal to the signal beam (Hsig), for supplying the signal beam (Hsig) to a first side of the Kerr medium (4), and for supplying the signal beam (Vsig) to a second side of the Kerr medium (4); a glass plate (14) for entering, onto the signal beam (Hsig), a control beam (Vcont) for causing a change in phase difference between the signal beam (Hsig) and the signal beam (Vsig); separating means for separating the control beam (Vcont) from the signal beam (Hsig) having traveled through the Kerr medium (4); and a detection section (10) provided so as to detect the phase difference between the signal beam (Hsig) and the signal beam (Vsig).

    摘要翻译： 能够根据由克尔介质中产生的交叉相位调制引起的相位差精确地评估克尔介质的光学非线性的光学非线性评估装置（1）包括：提供有克尔的极化Sagnac干涉路径（3） 中等（4）; 用于提供信号光束（Dsig）的光脉冲光源（7）; 用于将信号光束（Dsig）分离成信号光束（Hsig）的偏振分束器（PBS1）和与信号光束（Hsig）正交的方向偏振的信号光束（Vsig），用于提供信号光束（Hsig） 到所述克尔介质（4）的第一侧，并且用于将所述信号光束（Vsig）提供给所述克尔介质（4）的第二侧; 用于在信号光束（Hsig）上输入用于引起信号光束（Hsig）和信号光束（Vsig）之间的相位差变化的控制光束（Vcont）的玻璃板（14）; 分离装置，用于从已经穿过克尔介质（4）的信号光束（Hsig）分离控制光束（Vcont）; 以及检测部（10），以检测信号光束（Hsig）和信号光束（Vsig）之间的相位差。

    Method and apparatus of forming a magnetic disk with a servo sector and a data sector on a spiral track
    10.
    发明授权
    Method and apparatus of forming a magnetic disk with a servo sector and a data sector on a spiral track 有权
    在螺旋轨道上形成具有伺服扇区和数据扇区的磁盘的方法和装置

    公开(公告)号：US06466385B1

    公开(公告)日：2002-10-15

    申请号：US09673900

    申请日：2000-12-07

    申请人： Yoshio Umeda ,  Ryosuke Shimizu ,  Syuichi Yoshida ,  Tatsuaki Ishida ,  Kiyokazu Tohma ,  Keizo Miyata

    发明人： Yoshio Umeda ,  Ryosuke Shimizu ,  Syuichi Yoshida ,  Tatsuaki Ishida ,  Kiyokazu Tohma ,  Keizo Miyata

    IPC分类号： G11B586

    CPC分类号： G11B5/865 ,  G11B5/012 ,  G11B5/5521 ,  G11B5/59655 ,  G11B5/82 ,  G11B21/083 ,  G11B21/10 ,  G11B21/106

    摘要： A magnetic disk apparatus has: a head (2) that performs data recording and playback while moving relative to a magnetic disk (26) rotating at the prescribed speed; an actuator (3) that positions said head relative to said magnetic disk (26); and a controller (4) that detects the position of said head by means of servo sector that have positioning information recorded magnetically on said magnetic disk (1) and performs control to position said actuator (3) by means of this detection signal, wherein said magnetic disk (1) has at least a part in which the arrangement of tracks is spiral. The magnetic patterns on the disk include a servo sector and a data sector both formed on the same spiral track. The servo sector includes burst patterns for servo control.

    摘要翻译： 磁盘装置具有：头部（2），其在相对于以规定速度旋转的磁盘（26）移动的同时执行数据记录和重放; 致动器（3），其将所述头相对于所述磁盘（26）定位; 以及控制器（4），其通过具有磁性地记录在所述磁盘（1）上的定位信息的伺服扇区来检测所述磁头的位置，并通过该检测信号执行控制以定位所述致动器（3），其中所述 磁盘（1）至少具有一部分轨道的排列是螺旋形的。 磁盘上的磁图案包括伺服扇区和数据扇区，两者形成在相同的螺旋轨道上。 伺服扇区包括用于伺服控制的突发模式。