公开(公告)号：US20220263468A1

公开(公告)日：2022-08-18

申请号：US17626576

申请日：2020-06-26

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：US20220239256A1

公开(公告)日：2022-07-28

申请号：US17573841

申请日：2022-01-12

Applicant: NEC Corporation

Inventor： Yoshihito HASHIMOTO ,  Tsuyoshi Yamamoto ,  Tomohiro Yamaji

IPC: H03B15/00

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.

公开(公告)号：US20230299719A1

公开(公告)日：2023-09-21

申请号：US18134145

申请日：2023-04-13

Applicant: NEC Corporation

Inventor： Yoshihito HASHIMOTO ,  Tsuyoshi Yamamoto ,  Tomohiro Yamaji

IPC: H03B15/00 ,  H10N60/12

CPC classification number: H03B15/003 ,  H10N60/12

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.

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.