Patents by Inventor Yoshihito Hashimoto

Yoshihito Hashimoto 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).

  • Patent number: 11916513
    Abstract: An oscillator in which crosstalk can be reduced is provided. An oscillator includes a SQUID, a transmission line connected to the SQUID, a ground plane, and a first connection circuit disposed in a vicinity of a node of an electric field of a standing wave that is generated when the oscillator is oscillating, the first connection circuit connecting parts of the ground plane located on both sides of the transmission line to each other.
    Type: Grant
    Filed: April 13, 2023
    Date of Patent: February 27, 2024
    Assignee: NEC CORPORATION
    Inventors: Yoshihito Hashimoto, Tsuyoshi Yamamoto, Tomohiro Yamaji
  • Publication number: 20240016068
    Abstract: A superconducting quantum circuit includes: a first resonator having a superconducting quantum interference device and a capacitor that forms a closed loop together with the superconducting quantum interference device; and a control line being connected to a first control port and magnetically coupled to the superconducting quantum interference device, wherein the control line includes at least a first line having a characteristic impedance that indicates a first impedance value, and a second line being provided closer to a portion magnetically coupled to the superconducting quantum interference device than the first line and having a characteristic impedance that indicates a second impedance value being different from the first impedance value.
    Type: Application
    Filed: June 26, 2023
    Publication date: January 11, 2024
    Applicants: NEC Corporation, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Yohei KAWAKAMI, Yoshiro URADE, Yoshihito HASHIMOTO, Tsuyoshi YAMAMOTO
  • Publication number: 20230299719
    Abstract: An oscillator in which crosstalk can be reduced is provided. An oscillator includes a SQUID, a transmission line connected to the SQUID, a ground plane, and a first connection circuit disposed in a vicinity of a node of an electric field of a standing wave that is generated when the oscillator is oscillating, the first connection circuit connecting parts of the ground plane located on both sides of the transmission line to each other.
    Type: Application
    Filed: April 13, 2023
    Publication date: September 21, 2023
    Applicant: NEC Corporation
    Inventors: Yoshihito HASHIMOTO, Tsuyoshi Yamamoto, Tomohiro Yamaji
  • Publication number: 20230276717
    Abstract: Provided are an oscillator and a quantum computer capable of suppressing an occupied area of a circuit. An oscillator (300) includes a resonator (100) including a plurality of loop circuits in which a first superconducting line (112a), a first Josephson junction (111a), a second superconducting line (112b), and a second Josephson junction (111b) are annularly connected, and a magnetic field application circuit (200) including an electrode that goes around in a predetermined shape and configured to apply a magnetic field to the loop circuit, in which the electrode is arranged so as to face at least two of the loop circuits.
    Type: Application
    Filed: June 5, 2020
    Publication date: August 31, 2023
    Applicant: NEC Corporation
    Inventors: Akira MIYATA, Katsumi KIKUCHI, Suguru WATANABE, Takanori NISHI, Hideyuki SATOU, Tomohiro YAMAJI, Tsuyoshi YAMAMOTO, Yoshihito HASHIMOTO
  • Publication number: 20230237362
    Abstract: Provided is a quantum device capable of suppressing reduction in performance of quantum bit even when a quantum chip is flip-chip mounted on an interposer. A quantum chip (10) is flip-chip mounted on an interposer (20) by a bump (30). A coplanar line (12) coupling adjacent quantum bits is formed on the quantum chip (10). A gap (22) is provided, in the interposer (20), at a location facing a center conductor (12a) of the coplanar line (12). A second ground electrode (24) is formed around gap (22). The interposer (20) has a connection electrode (40) connecting the second ground electrode (24) around the gap (22). A bump (30A) formed in the vicinity of the connection electrode (40) is connected to the first ground electrode (12b) and the second ground electrode (24).
    Type: Application
    Filed: June 5, 2020
    Publication date: July 27, 2023
    Applicant: NEC Corporation
    Inventors: Akira MIYATA, Katsumi KIKUCHI, Suguru WATANABE, Takanori NISHI, Hideyuki SATOU, Tomohiro YAMAJI, Tsuyoshi YAMAMOTO, Yoshihito HASHIMOTO
  • Publication number: 20230171908
    Abstract: A sample holder includes: a pedestal made of metal; and a PCB (Printed Circuit Board) placed on the pedestal. The PCB includes a through opening that penetrates from a front surface to a rear surface of the PCB. The pedestal includes a cavity bottomed and with a top of the pedestal opened, the cavity formed at a portion corresponding to directly under the through opening on a side of the pedestal on which the PCB is placed. As a configuration on the side on which the PCB is placed, viewed from above, a part of the cavity is protruded outward from the through opening.
    Type: Application
    Filed: November 28, 2022
    Publication date: June 1, 2023
    Applicant: NEC Corporation
    Inventors: Yoshihito HASHIMOTO, Tsuyoshi Yamamoto
  • Patent number: 11658613
    Abstract: An oscillator in which crosstalk can be reduced is provided. An oscillator includes a SQUID, a transmission line connected to the SQUID, a ground plane, and a first connection circuit disposed in a vicinity of a node of an electric field of a standing wave that is generated when the oscillator is oscillating, the first connection circuit connecting parts of the ground plane located on both sides of the transmission line to each other.
    Type: Grant
    Filed: January 12, 2022
    Date of Patent: May 23, 2023
    Assignee: NEC CORPORATION
    Inventors: Yoshihito Hashimoto, Tsuyoshi Yamamoto, Tomohiro Yamaji
  • Publication number: 20220377879
    Abstract: A sample holder includes a base comprising a support structure and a printed circuit board (PCB) in contact with the base. The PCB includes: a dielectric; a front-surface ground (GND) formed on a front surface of the dielectric; a back-surface GND formed on a back surface of the dielectric; a through hole penetrating from the front-surface GND to the back-surface GND, the through hole in which a chip is disposed, and a conductor that electrically connects the front-surface GND and the back-surface GND on an end face of the through hole. At least a part of the base below the through hole has a cavity. The support structure that supports a surface of the chip and is electrically connected to the base. The support structure is disposed in the cavity.
    Type: Application
    Filed: May 17, 2022
    Publication date: November 24, 2022
    Applicant: NEC Corporation
    Inventors: Yoshihito HASHIMOTO, Tsuyoshi Yamamoto, Kohei Matsuura
  • Publication number: 20220377880
    Abstract: A sample holder includes a base comprising a support structure and a printed circuit board (PCB) in contact with the base. The PCB has a through hole. The PCB has a cavity in at least a part of the base below the through hole. The support structure that supports a surface of a chip and is electrically connected to the base. The support structure is disposed in the cavity. At least a part of the section supporting the chip in the support structure is not parallel to the back surface of the chip.
    Type: Application
    Filed: May 17, 2022
    Publication date: November 24, 2022
    Applicant: NEC Corporation
    Inventors: Yoshihito HASHIMOTO, Tsuyoshi YAMAMOTO, Kohei MATSUURA
  • Publication number: 20220318660
    Abstract: A superconducting circuit and a quantum computer capable of implementing four-body interaction using a plurality of superconducting qubit circuits supplied with signals of the same frequency are provided. A superconducting circuit (1) includes four superconducting qubit circuits (10), a coupling circuit (20) directly connected to the four superconducting qubit circuits (10). Each of the superconducting qubit circuits (10) indicates a qubit by being in a first phase state or a second phase state, when the number of the superconducting qubit circuits (10) in the first phase state among the four superconducting qubit circuits (10) is an even number, an interaction term of Hamiltonian of the superconducting circuit (1) takes a first value, and when the number of the superconducting qubit circuits (10) in the first phase state among the four superconducting qubit circuits (10) is an odd number, the interaction term takes a second value.
    Type: Application
    Filed: June 26, 2020
    Publication date: October 6, 2022
    Applicant: NEC Corporation
    Inventors: Masahiro HASEGAWA, Tsuyoshi YAMAMOTO, Yoshihito HASHIMOTO
  • Publication number: 20220261676
    Abstract: A resonator, an oscillator, and a quantum computer in which both moderate nonlinearity and a low loss are achieved, and the area occupied by the circuit can be reduced are provided. A resonator (100) includes at least one loop circuit (110) in which a first superconducting line (101), a first Josephson junction (103), a second superconducting line (102), and a second Josephson junction (104) are connected in a ring shape, at least one third Josephson junction (130) provided separately from the Josephson junction included in the loop circuit (110), and a capacitor (120), in which the loop circuit (110), the third Josephson junction (130), and the capacitor (120) are connected in a ring shape.
    Type: Application
    Filed: June 26, 2020
    Publication date: August 18, 2022
    Applicant: NEC Corporation
    Inventors: Tsuyoshi YAMAMOTO, Tomohiro YAMAJI, Yoshihito HASHIMOTO
  • Publication number: 20220263468
    Abstract: An oscillation apparatus includes: an oscillator including a resonator and a magnetic-field generating unit, the resonator including a loop circuit and a capacitor, the loop circuit including a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction connected in a ring shape, the magnetic-field generating unit being configured to apply a magnetic field to the loop circuit, and the oscillator being configured to perform parametric oscillation; a read-out unit for reading out an internal state of the oscillator; and a filter configured to restrict transmission of a signal in a predetermined frequency band. A circuit in which the capacitor and the loop circuit are connected in a ring shape is connected to the read-out unit through the filter.
    Type: Application
    Filed: June 26, 2020
    Publication date: August 18, 2022
    Applicant: NEC Corporation
    Inventors: Tsuyoshi YAMAMOTO, Yoshihito HASHIMOTO
  • Publication number: 20220263467
    Abstract: An oscillation apparatus includes: an oscillator including a resonator and a magnetic-field generation unit, the resonator including a loop circuit and a capacitor, the loop circuit including a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction connected in a ring shape, the magnetic-field generation unit being configured to apply a magnetic field to the loop circuit, and the oscillator being configured to perform parametric oscillation; a read-out unit for reading out an internal state of the oscillator; and a circuit component in which a coupling strength between the oscillator and the read-out unit is variable. The oscillator is connected to the read-out unit through the circuit component.
    Type: Application
    Filed: June 26, 2020
    Publication date: August 18, 2022
    Applicant: NEC Corporation
    Inventors: Tsuyoshi YAMAMOTO, Yoshihito HASHIMOTO
  • Publication number: 20220247407
    Abstract: A resonator, an oscillator, and a quantum computer in which the area occupied by the circuit can be reduced is provided. A resonator (100) includes a loop circuit (110) in which a first superconducting line (101), a first Josephson junction (103), a second superconducting line (102), and a second Josephson junction (104) are connected in a ring shape, and a capacitor (120). The capacitor (120) and the loop circuit (110) are connected in a ring shape.
    Type: Application
    Filed: June 26, 2020
    Publication date: August 4, 2022
    Applicant: NEC Corporation
    Inventors: Tsuyoshi YAMAMOTO, Tomohiro YAMAJI, Yoshihito HASHIMOTO
  • Publication number: 20220236342
    Abstract: An oscillator in which crosstalk can be reduced is provided. An oscillator includes a ground plane made of a superconductor, a conductive member spaced apart from and surrounded by the ground plane, a SQUID of which one end is connected to the conductive member and the other end is connected to the ground plane, a first connection circuit made of a superconductor, connecting parts of the ground plane located on both sides of a vicinity of a connection part between the conductive member and the SQUID to each other, and a superconducting loop circuit surrounding the SQUID and using the ground plane and the first connection circuit.
    Type: Application
    Filed: January 25, 2022
    Publication date: July 28, 2022
    Applicant: NEC Corporation
    Inventors: Yoshihito Hashimoto, Tsuyoshi Yamamoto, Tomohiro Yamaji
  • Publication number: 20220239256
    Abstract: An oscillator in which crosstalk can be reduced is provided. An oscillator includes a SQUID, a transmission line connected to the SQUID, a ground plane, and a first connection circuit disposed in a vicinity of a node of an electric field of a standing wave that is generated when the oscillator is oscillating, the first connection circuit connecting parts of the ground plane located on both sides of the transmission line to each other.
    Type: Application
    Filed: January 12, 2022
    Publication date: July 28, 2022
    Applicant: NEC Corporation
    Inventors: Yoshihito HASHIMOTO, Tsuyoshi Yamamoto, Tomohiro Yamaji
  • Publication number: 20220036229
    Abstract: A quantum device includes a quantum chip and a holder. The holder includes a pedestal, a recess portion formed in a main surface of the pedestal so as to be opposed to the quantum chip, and a suction tube provided such that in the recess portion, a suction opening is positioned in a bottom surface of the quantum chip.
    Type: Application
    Filed: July 14, 2021
    Publication date: February 3, 2022
    Applicant: NEC Corporation
    Inventors: Tomohiro Yamaji, Hideyuki Satou, Yoshihito Hashimoto, Aiko Uchiyama
  • Publication number: 20210116499
    Abstract: A calibration method, a calibration apparatus, and a program capable of estimating a degree of signal loss of an input signal supplied to an oscillator are provided. The calibration method includes: outputting an input signal to be input to an oscillator to be calibrated that includes a resonator and performs parametric oscillation, from a signal generator connected to the resonator via a transmission path while sweeping a frequency or a power of this input signal; acquiring distribution data of an intensity of a reflection signal based on measurement of the intensity of the reflection signal from the oscillator in response to the input signal; and estimating a degree of signal loss by comparing the distribution data acquired by the measurement with the distribution data theoretically obtained in which a value of the degree of the signal loss of the transmission path is assumed.
    Type: Application
    Filed: September 29, 2020
    Publication date: April 22, 2021
    Applicant: NEC CORPORATION
    Inventors: Tsuyoshi YAMAMOTO, Yoshihito Hashimoto
  • Patent number: 10843171
    Abstract: An oxidation catalyst is described for treating an exhaust gas from a diesel engine, which oxidation catalyst comprises: a substrate; a first washcoat region disposed on the substrate, wherein the first washcoat region comprises a first platinum group metal (PGM) and a first support material; a second washcoat region adjacent to the first washcoat region, wherein the second washcoat region comprises a second platinum group metal (PGM) and a second support material; a third washcoat region disposed on the substrate, wherein the third washcoat region comprises a third platinum group metal (PGM) and a third support material; and wherein either: (i) the third washcoat region is adjacent to the second washcoat region; or (ii) the second washcoat region is disposed or supported on the third washcoat region. Also described are uses and methods involving the oxidation catalyst.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: November 24, 2020
    Assignee: Johnson Matthey Public Limited Company
    Inventors: Penelope Markatou, Yaritza M. Lopez-De Jesus, Wassim Klink, Kieran John Cole, Colin Russell Newman, Robert Hanley, Yoshihito Hashimoto, Masahito Shibata
  • Patent number: 10562013
    Abstract: This oxidation catalyst for diesel engines is divided into an upstream-side catalyst layer and a downstream-side inner catalyst layer in the flow direction of the exhaust gas, and a downstream-side outer catalyst layer is additionally formed so as to cover the surface of the downstream-side inner catalyst layer. The upstream-side catalyst layer and the downstream-side inner catalyst layer contain Pd, and the downstream-side outer catalyst layer contains Pt. The amounts of Pt and Pd contained in the upstream-side catalyst layer and the amounts of Pt and Pd contained in the downstream-side inner catalyst layer are constantly set to certain values, while the amount of Pt contained in the downstream-side outer catalyst layer is set to a value which enables the oxidation efficiency to be at a predetermined value or higher.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: February 18, 2020
    Assignees: YANMAR CO., LTD., JOHNSON MATTHEY PUBLIC LIMITED COMPANY
    Inventors: Ken Kawabe, Shohei Hoshino, Masahito Shibata, Yoshihito Hashimoto