公开(公告)号：US20220269968A1

公开(公告)日：2022-08-25

申请号：US17629718

申请日：2020-02-28

Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY

Inventor： Atsushi NOGUCHI ,  Yasunobu NAKAMURA

IPC: G06N10/40 ,  H01L39/22

Abstract: A quantum gate device includes a first superconducting circuit which resonates at a first resonance frequency, second superconducting circuit which resonates at a second resonance frequency, and connector which connects these circuits. The first superconducting circuit includes a single first Josephson device, second Josephson device group, and first capacitor. The second Josephson device group includes n Josephson devices connected by a line made of a superconductor. The Josephson energy possessed by each of the n Josephson devices is greater than n times that of the first Josephson device. The quantum gate device further includes a magnetic field applier which applies a static magnetic field to the partial superconducting circuit, and an electromagnetic wave irradiator (first electromagnetic wave irradiator) which irradiates the first superconducting circuit and/or second superconducting circuit with an electromagnetic wave having a difference frequency which is equal to the difference between the first and second resonance frequencies.

公开(公告)号：US20230189666A1

公开(公告)日：2023-06-15

申请号：US17926073

申请日：2021-04-08

Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY

Inventor： Atsushi NOGUCHI ,  Alto OSADA ,  Yasunobu NAKAMURA

IPC: H10N69/00 ,  G06N10/20

CPC classification number: H10N69/00 ,  G06N10/20

Abstract: A quantum gate device includes a first superconducting circuit which includes at least one of Josephson devices in an annular circuit including a superconducting wire and resonates at a first resonance frequency, a second superconducting circuit which includes at least one of Josephson devices in an annular circuit including a superconducting wire and resonates at a second resonance frequency, a connection unit which includes a capacitor and a superconducting wire provided at each electrode of the capacitor and connects the first and second circuits, a magnetic field application means applying a magnetic field to one or both of the first and second circuits, a quantum gate control electromagnetic wave irradiation unit irradiating one of the first and second circuits with a control electromagnetic wave, and an unnecessary transition suppression electromagnetic wave irradiation unit irradiating one of the first and second circuits with an unnecessary interaction suppression electromagnetic wave.