公开(公告)号：US20190121834A1

公开(公告)日：2019-04-25

申请号：US16031135

申请日：2018-07-10

Applicant: Hitachi, Ltd.

Inventor： Tatsuya TOMARU

IPC: G06F17/11 ,  G06N99/00

Abstract: An object of the invention is to provide a computing technology which can operate at room temperature and have a sufficient performance for combinatorial optimization problems that need an exhaustive search. In a local-field response method in which spins being variables respond to local effective magnetic fields, a time axis is discretely treated. When spins respond to effective magnetic fields, the effective magnetic fields are determined sequentially from the site having the small magnitude of a spin, and spins respond to the fields in order. When the sign of a spin is inverted, the information is reflected in the subsequent process of determining the effective magnetic fields for other sites. Thus, a many-body effect due to quantum entanglement is phenomenologically incorporated.

公开(公告)号：US20180089144A1

公开(公告)日：2018-03-29

申请号：US15561566

申请日：2015-03-27

Applicant: Hitachi, Ltd.

Inventor： Tatsuya TOMARU

IPC: G06F17/11

CPC classification number: G06F17/11 ,  G06N5/003 ,  G06N99/002

Abstract: Provided is a computer that does not need quantum coherence or a cryogenic cooling device for a problem to be solved that needs an exhaustive search and a computing program thereof. Spin sj as a variable is caused to follow a local effective magnetic field Bj to introduce a system to a ground state of a problem-setting system. The ground state is a solution. At t=0, the magnetic field Bj is applied in the x-axis direction at all sites and all spins sj are initialized to the x-axis direction. With the lapse of time t, a magnetic field in the z-axis direction and interspin interaction are gradually applied, spin becomes +z-direction or −z-direction finally, and the z-component of spin sj becomes sjz=+1 or −1. When the direction spin sj is caused to follow the direction of the effective magnetic field Bj, a relaxation term to keep the direction of spin sj is introduced to improve convergence of a solution.

公开(公告)号：US20160328208A1

公开(公告)日：2016-11-10

申请号：US15108905

申请日：2014-02-06

Applicant: HITACHI, LTD.

Inventor： Tatsuya TOMARU

IPC: G06F7/548 ,  G06N99/00

CPC classification number: G06F7/548 ,  G06N99/002

Abstract: A classical technique relying on thermodynamics is used, and spin sj, which is a variable, is made to follow a local effective magnetic field Bj to bring a system to a ground state of a problem-setting system. The ground state is a solution thereof. At t=0, the effective magnetic field Bj is applied rightward in all the sites, and all the spins sj are initialized rightward. The magnetic field in the z axis direction and the interaction between spins are gradually applied with time t, which finally brings the spins in the +z direction or the −z direction, and the z components of the spins sj become sjz=+1 or −1. In addition, correction parameters originating from quantum mechanical effects are introduced when the direction of the spin sj is made to follow the direction of the effective magnetic field Bj so as to improve calculation performance.

Abstract translation: 使用依赖于热力学的经典技术，并且使作为变量的旋转sj遵循局部有效磁场Bj使系统处于问题设定系统的基态。 基态是其解决方案。 在t = 0时，有效磁场Bj向所有位置向右施加，所有的自旋sj向右初始化。 z轴方向的磁场和自旋之间的相互作用逐渐被施加，时间t最终使旋转在+ z方向或-z方向，而自旋sj的z分量变为sjz = + 1或 -1。 此外，当使旋转方向sj跟随有效磁场Bj的方向时，引入源自量子力学效应的校正参数，以提高计算性能。

公开(公告)号：US20160118106A1

公开(公告)日：2016-04-28

申请号：US14890335

申请日：2013-05-31

Applicant: HITACHI, LTD.

Inventor： CHIHIRO YOSHIMURA ,  Masanao YAMAOKA ,  Tomonori SEKIGUCHI ,  Tatsuya TOMARU

IPC: G11C11/419

CPC classification number: G11C11/419 ,  G06F7/588 ,  G06N3/08 ,  G11C7/04 ,  G11C7/1006 ,  G11C11/1675

Abstract: It is an object of the present invention to provide a device which can be easily manufactured and obtain a ground state of an arbitrary Ising model. A semiconductor device includes a first memory cell and a second memory cell that interacts with the first memory cell, in which storage content of the first memory cell and the second memory cell is stochastically inverted. The storage content is stochastically inverted by dropping threshold voltages of the first memory cell and the second memory cell. The threshold voltages of the first and second memory cells are dropping by controlling substrate biases, power voltages, or trip points of the first and second memory cells.

Abstract translation: 本发明的一个目的是提供一种易于制造并获得任意伊辛模型的基态的装置。 半导体器件包括第一存储器单元和与第一存储器单元相互作用的第二存储器单元，其中第一存储单元和第二存储器单元的存储内容随机转换。 通过降低第一存储单元和第二存储单元的阈值电压，存储内容随机地反转。 通过控制第一和第二存储器单元的衬底偏置，电源电压或跳变点，第一和第二存储器单元的阈值电压下降。

公开(公告)号：US20210064994A1

公开(公告)日：2021-03-04

申请号：US16922395

申请日：2020-07-07

Applicant: HITACHI, LTD.

Inventor： Tatsuya TOMARU

IPC: G06N3/08 ,  G06N3/063 ,  G06F7/544

Abstract: A machine learning device includes a general arithmetic device that calculates data, and a reservoir arithmetic device including an input unit, an output unit, and one or more nodes. The reservoir arithmetic device performs a certain calculation on data and performs calculation in response to an input value input through an input unit using the dynamics of the nodes. Each node i outputs a measurement outcome zi(tk) at a time point tk. The general arithmetic device calculates y(tk)=Σizi(tk)wi. In the calculation of y(tk), in addition to zi(tk) at the time point zi(tk), the term zi(tk′) at a time point tk′ (tk′≠tk) is included. Thus, the calculation of y(tk) is performed by redundantly using zi(tk) at different time points, with the range of sum with respect to the subscript i being i=1, . . . qn, where q is redundancy.

公开(公告)号：US20160112189A1

公开(公告)日：2016-04-21

申请号：US14897390

申请日：2013-06-12

Applicant: HITACHI, LTD.

Inventor： Tatsuya TOMARU

IPC: H04L9/06 ,  H04L9/08

CPC classification number: H04L9/0662 ,  H04K1/02 ,  H04L9/06 ,  H04L9/0822 ,  H04L2209/34

Abstract: The objective of the invention is to provide an encoding method and a communication method wherein bit-error correction is easy for a authorized recipient but difficult for an unauthorized recipient. A transmission channel in which bit errors are moderately controlled is used to transmit/receive a random number sequence. A common key is shared between a transmitter and a receiver in advance; each bit value of the common key is connected with each slot of the random number sequence; the common key is used to divide the random number sequence into two or more random number series in accordance with the connection; and each random number series is independently encoded and parity check symbols are generated. The unit of the encoding is equal to or greater than the length of the common key so as to make a partial analysis by an unauthorized recipient impossible.

Abstract translation: 本发明的目的是提供一种编码方法和通信方法，其中针对授权的接收方容易进行误码校正，但是对于未经授权的接收者而言是困难的。 使用其中适度控制位错误的传输信道来发送/接收随机数序列。 预先在发射机和接收机之间共享公共密钥; 公共密钥的每个比特值与随机数序列的每个时隙连接; 公共密钥用于根据连接将随机数序列划分为两个或更多个随机数序列; 并且每个随机数序列被独立地编码，并且生成奇偶校验符号。 编码的单位等于或大于公共密钥的长度，以便由未经授权的接收者进行部分分析。

公开(公告)号：US20220398481A1

公开(公告)日：2022-12-15

申请号：US17687751

申请日：2022-03-07

Applicant: Hitachi, Ltd.

Inventor： Tatsuya TOMARU

IPC: G06N10/20

Abstract: The present invention aims at enabling a gate-type quantum computer to deal with actual problems. There is provided a quantum computer including: a quantum register holding qubits, a control gate performing an operation on the quantum register, and a readout unit observing a state of the quantum register; and the quantum computer repeating longitudinal relaxation to the ground state by gradually changing Hamiltonian H(t) for a predetermined time, wherein the unitary operation determined by the Hamiltonian H(t) at each time is performed with the control gate for a time of about a longitudinal relaxation time, the quantum state is relaxed every time of about the longitudinal relaxation time, and the ground state prepared for an initial state is time-evolved to the ground state of the Hamiltonian which is defined as a problem.

公开(公告)号：US20200169542A1

公开(公告)日：2020-05-28

申请号：US16695485

申请日：2019-11-26

Applicant: Hitachi, Ltd.

Inventor： Tatsuya TOMARU

IPC: H04L29/06

Abstract: In a network system that connects a site 100 and a site 200 to each other via an open network and a closed network, an interface 131 performs control so that format information of confidential information can pass but the confidential information cannot pass therethrough between a computer 111 and a computer 121. An interface 231 performs control so that format information of confidential information can pass but the confidential information cannot pass therethrough between a computer 211 and a computer 221.