公开(公告)号：US20250007462A1

公开(公告)日：2025-01-02

申请号：US18589512

申请日：2024-02-28

Applicant: NEC Corporation

Inventor： Tsuyoshi YAMAMOTO ,  Yoshihito HASHIMOTO

IPC: H03B15/00 ,  G06N10/00

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.

公开(公告)号：US20240202560A1

公开(公告)日：2024-06-20

申请号：US18286719

申请日：2022-04-13

Applicant: NEC CORPORATION ,  National Institute of Advanced Industrial Science and Technology ,  NATIONAL UNIVERSITY CORPORATION YOKOHAMA NATIONAL UNIVERSITY

Inventor： Naoki TAKEUCHI ,  Nobuyuki YOSHIKAWA ,  Yoshihito HASHIMOTO ,  Tsuyoshi YAMAMOTO ,  Fuminori HIRAYAMA

IPC: G06N10/20 ,  G01R33/00 ,  G01R33/035 ,  H02M7/00

CPC classification number: G06N10/20 ,  G01R33/0011 ,  G01R33/035 ,  H02M7/003

Abstract: A magnetic flux bias circuit includes an input signal line to which an input signal indicating an applied magnetic flux using a digital value is input, a first current control line, a second current control line, and a third current control line to which a clock signal according to the input signal is input, a digital/analog conversion unit converting the input signal into an analog signal using a circuit including a quantum flux parametron circuit on the basis of the input signal input to the input signal line and the clock signal input to the first current control line, the second current control line, and the third current control line, and a magnetic flux application unit applying an applied magnetic flux to a controlled object on the basis of the analog signal output from the digital/analog conversion unit.

公开(公告)号：US20220261680A1

公开(公告)日：2022-08-18

申请号：US17626967

申请日：2020-06-26

Applicant: NEC Corporation

Inventor： Masahiro HASEGAWA ,  Tsuyoshi YAMAMOTO ,  Yoshihoto HASHIMOTO

IPC: G06N10/40 ,  H01L27/18 ,  H03K17/92

Abstract: A superconducting circuit and a quantum computer capable of implementing four-body interaction while reducing an amount of hardware are provided. A superconducting circuit (1) includes four superconducting qubit circuits (10), a coupling circuit (20) inductively coupled 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.

公开(公告)号：US20200091867A1

公开(公告)日：2020-03-19

申请号：US16519280

申请日：2019-07-23

Applicant: KABUSHIKI KAISHA TOSHIBA ,  NEC CORPORATION

Inventor： Hayato GOTO ,  Tsuyoshi YAMAMOTO

IPC: H03B28/00 ,  H01L27/18 ,  H01L39/22 ,  G06N10/00

Abstract: According to one embodiment, an electronic circuit includes a first conductive component, a second conductive component, a first current path, and a second current path. The second conductive component is capacitively coupled to the first conductive component. The first current path of a superconductor includes a first portion and a second portion. The first portion is connected to the first conductive component. The second portion is connected to the second conductive component. The first current path includes N first Josephson junctions connected in series and provided between the first and second portions. The second current path of a superconductor includes a third portion and a fourth portion. The third portion is connected to the first conductive component. The fourth portion is connected to the second conductive component. The second current path includes a second Josephson junction connected in series and provided between the third and fourth portions.

公开(公告)号：US20220318660A1

公开(公告)日：2022-10-06

申请号：US17626971

申请日：2020-06-26

Applicant: NEC Corporation

Inventor： Masahiro HASEGAWA ,  Tsuyoshi YAMAMOTO ,  Yoshihito HASHIMOTO

IPC: G06N10/40 ,  H01L27/18 ,  H01L39/22

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.

公开(公告)号：US20220261676A1

公开(公告)日：2022-08-18

申请号：US17626588

申请日：2020-06-26

Applicant: NEC Corporation

Inventor： Tsuyoshi YAMAMOTO ,  Tomohiro YAMAJI ,  Yoshihito HASHIMOTO

IPC: G06N10/00 ,  H03B15/00 ,  H01L39/22 ,  H03K3/38

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.

公开(公告)号：US20220247407A1

公开(公告)日：2022-08-04

申请号：US17626567

申请日：2020-06-26

Applicant: NEC Corporation

Inventor： Tsuyoshi YAMAMOTO ,  Tomohiro YAMAJI ,  Yoshihito HASHIMOTO

IPC: H03K17/92 ,  H03B15/00 ,  G06N10/40

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.

公开(公告)号：US20210116499A1

公开(公告)日：2021-04-22

申请号：US17036820

申请日：2020-09-29

Applicant: NEC CORPORATION

Inventor： Tsuyoshi YAMAMOTO ,  Yoshihito Hashimoto

IPC: G01R31/317 ,  G06N10/00

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.

公开(公告)号：US20230237362A1

公开(公告)日：2023-07-27

申请号：US18007769

申请日：2020-06-05

Applicant: NEC Corporation

Inventor： Akira MIYATA ,  Katsumi KIKUCHI ,  Suguru WATANABE ,  Takanori NISHI ,  Hideyuki SATOU ,  Tomohiro YAMAJI ,  Tsuyoshi YAMAMOTO ,  Yoshihito HASHIMOTO

IPC: G06N10/40 ,  G01R33/035

CPC classification number: G06N10/40 ,  G01R33/0354

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).

公开(公告)号：US20220263467A1

公开(公告)日：2022-08-18

申请号：US17625413

申请日：2020-06-26

Applicant: NEC Corporation

Inventor： Tsuyoshi YAMAMOTO ,  Yoshihito HASHIMOTO

IPC: H03B15/00 ,  G06N10/40 ,  H01L39/22

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.