Patents by Inventor Chihiro Yoshimura

Chihiro Yoshimura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240070509
    Abstract: A control system for controlling a quantum computer is coupled to an analog control unit configured to generate a control signal for controlling a quantum bit device including a plurality of quantum bits. The control system converts, first control flow data which is described in a code format and defines control details of the quantum bit device into second control flow data which defines the control details of the quantum bit device by the analog control unit; and generate a plurality of the control data patterns from the second control flow data based on the third setting information.
    Type: Application
    Filed: February 21, 2023
    Publication date: February 29, 2024
    Inventors: Atsushi MIYAMOTO, Chihiro YOSHIMURA
  • Patent number: 10896241
    Abstract: An information processing apparatus manufactured at low cost and with ease and that is capable of making a search for a ground state of an arbitrary Ising model. An information processing unit containing a plurality of semiconductor chips, each retains a value of one spin or values of a plurality of spins and simulates interactions among the spins, inter-chip wiring between the necessary semiconductor chips, and a control unit that cause each semiconductor chip to perform interaction computation. The control unit converts data of a problem into data of a lattice-shaped Ising model, which is possibly expressed by the plurality of semiconductor chips, without causing a spin arrangement, in a ground state of an Ising model for the problem, to be changed. The data of the lattice-shaped Ising model is divided for allocation to the plurality of semiconductor chips, and causes each semiconductor chip to perform the interaction computation.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: January 19, 2021
    Assignee: HITACHI, LTD.
    Inventors: Takuya Okuyama, Masanao Yamaoka, Chihiro Yoshimura, Masato Hayashi, Akihito Akai
  • Patent number: 10795404
    Abstract: An aspect of the present invention for solving the above problem is a system including a first computer, a control module controlled by the first computer, and a second computer configured to be associated with the control module. The second computer includes a plurality of units, and each of the plurality of units includes a first memory that stores a value indicating a state of a node, a second memory that stores a coefficient, and an arithmetic circuit. The arithmetic circuit performs an arithmetic process of determining a value indicating a state of a node of its own unit, based on a value indicating a state of a node of a different unit and the coefficient of its own unit, and storing the determined value in the first memory. The control module supplies a control signal for controlling the arithmetic process to the second computer.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: October 6, 2020
    Assignee: HITACHI, LTD.
    Inventors: Masanao Yamaoka, Takeshi Kato, Chihiro Yoshimura, Masato Hayashi
  • Publication number: 20190155330
    Abstract: An aspect of the present invention for solving the above problem is a system including a first computer, a control module controlled by the first computer, and a second computer configured to be associated with the control module. The second computer includes a plurality of units, and each of the plurality of units includes a first memory that stores a value indicating a state of a node, a second memory that stores a coefficient, and an arithmetic circuit. The arithmetic circuit performs an arithmetic process of determining a value indicating a state of a node of its own unit, based on a value indicating a state of a node of a different unit and the coefficient of its own unit, and storing the determined value in the first memory. The control module supplies a control signal for controlling the arithmetic process to the second computer.
    Type: Application
    Filed: August 24, 2015
    Publication date: May 23, 2019
    Inventors: Masanao YAMAOKA, Takeshi KATO, Chihiro YOSHIMURA, Masato HAYASHI
  • Patent number: 10191880
    Abstract: A semiconductor device in which a ground state of an Ising model is realized, includes a spin array in which a spin unit is formed, the spin unit including a memory cell storing a value of one spin in an Ising model, a memory cell storing an interaction coefficient from an adjacent spin interacting with the spin, a memory cell storing an external magnetic field coefficient of the spin, and a circuit deciding a next state of the spin by binary majority decision logic based on a product of the value of each of the adjacent spins and the corresponding interaction coefficient, and the external magnetic field coefficient. The spin array is formed by having a plurality of the spin units, each having each spin allocated thereto, arranged and connected on a two-dimensional plane on a semiconductor substrate in the state where a topology of the Ising model is maintained.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: January 29, 2019
    Assignee: HITACHI, LTD.
    Inventors: Chihiro Yoshimura, Masanao Yamaoka
  • Publication number: 20180300287
    Abstract: An information processing apparatus manufactured at low cost and with ease and that is capable of making a search for a ground state of an arbitrary Ising model. An information processing unit containing a plurality of semiconductor chips, each retains a value of one spin or values of a plurality of spins and simulates interactions among the spins, inter-chip wiring between the necessary semiconductor chips, and a control unit that cause each semiconductor chip to perform interaction computation. The control unit converts data of a problem into data of a lattice-shaped Ising model, which is possibly expressed by the plurality of semiconductor chips, without causing a spin arrangement, in a ground state of an Ising model for the problem, to be changed. The data of the lattice-shaped Ising model is divided for allocation to the plurality of semiconductor chips, and causes each semiconductor chip to perform the interaction computation.
    Type: Application
    Filed: June 9, 2015
    Publication date: October 18, 2018
    Applicant: HITACHI, LTD.
    Inventors: Takuya OKUYAMA, Masanao YAMAOKA, Chihiro YOSHIMURA, Masato HAYASHI, Akihito AKAI
  • Patent number: 10089421
    Abstract: An information processing unit and information processing method capable of performing a ground-state search of an Ising model having coefficients of arbitrary values regardless of restrictions on hardware or software is suggested. When a ground state of an original problem, which is an Ising model, or an approximate solution of that ground state is calculated as a solution of the original problem, one or more sub-problems which are Ising models are generated from the original problem and the information processing unit searches the ground state of each generated sub-problem and generates a solution of the original problem based on a solution of each sub-problem obtained from the search; and when types of coefficient values of an Ising model whose ground state can be searched are limited, sub-problems which are Ising models composed of the types of limited values of coefficients are generated.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: October 2, 2018
    Assignees: HITACHI, LTD., INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, RESEARCH ORGANIZATION OF INFORMATION AND SYSTEMS
    Inventors: Chihiro Yoshimura, Masanao Yamaoka, Ken-ichi Kawarabayashi, Takuro Fukunaga, Taro Takaguchi, Takanori Maehara, Takuya Ohwa
  • Patent number: 10073655
    Abstract: A semiconductor integrated circuit apparatus 23 is used for obtaining an optimum solution using an Ising model, and the semiconductor integrated circuit apparatus 23 includes plural spin cells 1 that are connected with each other. Here, each spin cell 1 includes: a memory cell 9(N) for memorizing a spin value; a computing circuit 10 for computing interactions among the plural spin cells that are connected with each other; a memory circuit 4 for holding at least one-bit data; and an inversion logic circuit LG capable of modifying a computed result obtained by the computing circuit in accordance with data held by the memory circuit 4. The computed result modified by a modification circuit in accordance with the data held by the memory circuit is memorized in the memory cell 9(N) included in each spin cell 1.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: September 11, 2018
    Assignee: HITACHI, LTD.
    Inventors: Masanao Yamaoka, Chihiro Yoshimura
  • Patent number: 10037391
    Abstract: A semiconductor device is provided with a plurality of semiconductor chips, each of which simulates interactions between nodes of an interaction model, and an inter-chip wire, wherein the plurality of semiconductor chips are used to simulate interactions between nodes of a single interaction model; each semiconductor chip includes a connection unit that sends and receives some of the values indicating the state of the nodes, which are retained by a necessary element unit, via inter-chip wire to and from another semiconductor chip or sends and receives the values indicating state of the nodes, which are retained by the necessary element unit to and from the other semiconductor chip while sharing the inter-chip wire by means of time sharing.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: July 31, 2018
    Assignee: HITACHI, LTD.
    Inventors: Masato Hayashi, Chihiro Yoshimura, Masanao Yamaoka
  • Patent number: 9946513
    Abstract: A spin unit provided with a memory cell that stores a value of one spin of an Ising model, a memory cell that stores an interaction coefficient from an adjacent spin which interacts with the corresponding spin, a memory cell that stores an external magnetic field coefficient of the one spin and circuits that determine the next state of the one spin on the basis of a product of a value of each adjacent spin and the corresponding interaction coefficient and the external magnetic field coefficient is configured, the semiconductor device is provided with a spin array where the plural spin units are arranged and connected on a two-dimensional plane on a semiconductor substrate, a random number generator and a bit regulator, the bit regulator operates output of the random number generator and supplies a random bit to all spin units in the spin array via one wire.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: April 17, 2018
    Assignee: HITACHI, LTD.
    Inventors: Masato Hayashi, Masanao Yamaoka, Chihiro Yoshimura
  • Patent number: 9823882
    Abstract: In a semiconductor device in which components to be a basic configuration unit are arranged in an array shape for calculating an interaction model, a technique capable of changing a topology between the components is provided. A semiconductor device includes a plurality of units each of which includes a first memory cell for storing a value indicating a state of one node of an interaction model, a second memory cell for storing an interaction coefficient indicating an interaction from a node connected to the one node, and a calculation circuit for determining a value indicating a next state of the one node based on a value indicating a state of the connected node and on the interaction coefficient. In addition, the semiconductor device includes a plurality of switches for connecting or disconnecting the plurality of units to/from each other.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: November 21, 2017
    Assignee: HITACHI, LTD.
    Inventors: Masanao Yamaoka, Kenichi Osada, Chihiro Yoshimura
  • Patent number: 9804827
    Abstract: A highly-convenient information processing system capable of obtaining a solution of a problem under conditions desired by a user and a management apparatus capable of enhancing the convenience of the information processing system are suggested.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: October 31, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Masato Hayashi, Chihiro Yoshimura, Masanao Yamaoka
  • Publication number: 20170262226
    Abstract: A semiconductor integrated circuit apparatus 23 is used for obtaining an optimum solution using an Ising model, and the semiconductor integrated circuit apparatus 23 includes plural spin cells 1 that are connected with each other. Here, each spin cell 1 includes: a memory cell 9(N) for memorizing a spin value; a computing circuit 10 for computing interactions among the plural spin cells that are connected with each other; a memory circuit 4 for holding at least one-bit data; and an inversion logic circuit LG capable of modifying a computed result obtained by the computing circuit in accordance with data held by the memory circuit 4. The computed result modified by a modification circuit in accordance with the data held by the memory circuit is memorized in the memory cell 9(N) included in each spin cell 1.
    Type: Application
    Filed: September 3, 2014
    Publication date: September 14, 2017
    Applicant: HITACHI, LTD.
    Inventors: Masanao YAMAOKA, Chihiro YOSHIMURA
  • Publication number: 20170185380
    Abstract: A spin unit provided with a memory cell that stores a value of one spin of an Ising model, a memory cell that stores an interaction coefficient from an adjacent spin which interacts with the corresponding spin, a memory cell that stores an external magnetic field coefficient of the one spin and circuits that determine the next state of the one spin on the basis of a product of a value of each adjacent spin and the corresponding interaction coefficient and the external magnetic field coefficient is configured, the semiconductor device is provided with a spin array where the plural spin units are arranged and connected on a two-dimensional plane on a semiconductor substrate, a random number generator and a bit regulator, the bit regulator operates output of the random number generator and supplies a random bit to all spin units in the spin array via one wire.
    Type: Application
    Filed: July 9, 2014
    Publication date: June 29, 2017
    Inventors: Masato HAYASHI, Masanao YAMAOKA, Chihiro YOSHIMURA
  • Patent number: 9666252
    Abstract: A semiconductor device includes a spin array in which a plurality of memory cells are disposed in a matrix configuration, a group of a predetermined number of memory cells is collected in units of spin units, and a plurality of the spin units are disposed with an adjacency; a word line provided in correspondence with rows of the memory cells; a bit line pair provided in correspondence with columns of the memory cells; a multiword decoder configured to multiplex a word address according to an input of a multiplicity specify signal to a word line and simultaneously activate a plurality of word lines; and a bit line driver configured to subject a plurality of memory cells, of the memory cells connected to bit line pairs and arrayed in a column direction, activated by the plurality of the word lines to a write operation or a read operation.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: May 30, 2017
    Assignee: HITACHI, LTD.
    Inventors: Chihiro Yoshimura, Masanao Yamaoka
  • Patent number: 9633715
    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.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: April 25, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Chihiro Yoshimura, Masanao Yamaoka, Tomonori Sekiguchi, Tatsuya Tomaru
  • Patent number: 9606965
    Abstract: A semiconductor device includes a plurality of spin units individually including a memory cell configured to store values of spins in an Ising model, a memory cell configured to store an interaction coefficient from an adjacent spin that exerts an interaction on the spin, a memory cell configured to store an external magnetic field coefficient of the spin, and an interaction circuit configured to determine a subsequent state of the spin. The spin units individually include a random number generator configured to supply the random number to the plurality of the spin units and generate two-valued simulated coefficients of two values or simulated coefficients of three values in performing an interaction to determine a subsequent state of a spin of the spin units from a value of a spin from an adjacent spin unit, an interaction coefficient, and an external magnetic field coefficient.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: March 28, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Chihiro Yoshimura, Masato Hayashi, Masanao Yamaoka
  • Publication number: 20170068632
    Abstract: A semiconductor device in which a ground state of an Ising model is realized, includes a spin array in which a spin unit is formed, the spin unit including a memory cell storing a value of one spin in an Ising model, a memory cell storing an interaction coefficient from an adjacent spin interacting with the spin, a memory cell storing an external magnetic field coefficient of the spin, and a circuit deciding a next state of the spin by binary majority decision logic based on a product of the value of each of the adjacent spins and the corresponding interaction coefficient, and the external magnetic field coefficient. The spin array is formed by having a plurality of the spin units, each having each spin allocated thereto, arranged and connected on a two-dimensional plane on a semiconductor substrate in the state where a topology of the Ising model is maintained.
    Type: Application
    Filed: March 4, 2014
    Publication date: March 9, 2017
    Inventors: Chihiro YOSHIMURA, Masanao YAMAOKA
  • Patent number: 9472306
    Abstract: A semiconductor device capable of easily and properly detecting a defective element unit(s) and a quality management method for the semiconductor device are suggested. A semiconducting device simulating interactions between nodes in an interaction model is equipped with a quality management unit for managing the quality of each element unit provided corresponding to each node, wherein the quality management unit executes a specified quality test of each element unit, compares test results of the quality test with pre-given results to be obtained from the quality test, and detects a defective memory cell(s) and a defective element unit(s) based on the comparison results.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: October 18, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Masanao Yamaoka, Goichi Ono, Chihiro Yoshimura, Masato Hayashi
  • Patent number: 9466346
    Abstract: A semiconductor device has a plurality of units, each of which includes a first memory cell that stores a value indicating a state of one node of an interaction model, a second memory cell that stores an interaction coefficient indicating an interaction from a node connected to the one node, and a third memory cell that stores a bias coefficient of the one node. Furthermore, the semiconductor device has a computing circuit that determines a value indicating a next state of the one node based on a value indicating a state of the connected node, the interaction coefficient and the bias coefficient. Also, each of the second memory cell and the third memory cell in the plurality of units includes multi-valued memory cells.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: October 11, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Masanao Yamaoka, Chihiro Yoshimura