Title:
QUANTUM GATE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/235132
Kind Code:
A1
Abstract:
A quantum gate device 10 is provided with: a first superconducting circuit 11 which includes at least one Josephson element 111, 1121, 1122 in an annular circuit comprising a superconducting wire 115 and resonates at a first resonance frequency; a second superconducting circuit 12 which includes at least one Josephson element 121 in an annular circuit comprising a superconducting wire 125 and resonates at a second resonance frequency different from the first resonance frequency; a connecting portion 13 which comprises a capacitor 134 and superconducting wires 135 provided at both poles of the capacitor 134 and connects the first superconducting circuit 11 and the second superconducting circuit 12; a magnetic field applying means 14 for applying a magnetic field to one or both of the first superconducting circuit 11 and the second superconducting circuit 12; a quantum gate-controlling electromagnetic wave-irradiating unit 15 for irradiating one of the first superconducting circuit 11 and the second superconducting circuit 12 with a control electromagnetic wave having a control frequency corresponding to an energy difference between two energy states which, among a plurality of quantized energy states formed by the first superconducting circuit 11 and the second superconducting circuit 12, contribute to the operation of a quantum gate; and an unwanted transition-suppressing electromagnetic wave-irradiating unit 16 which irradiates one of the first superconducting circuit 11 and the second superconducting circuit 12 with an unwanted interaction-suppressing electromagnetic wave. The unwanted interaction-suppressing electromagnetic wave has an unwanted interaction-suppressing frequency which is a frequency between a first frequency and a second frequency, the first frequency corresponding to an original energy difference between, among three of the plurality of energy states, a highest first energy state and a second energy state having a second-highest energy, and the second frequency corresponding to an original energy difference between the second energy state and a third energy state having a lowest energy, the unwanted interaction-suppressing frequency differing by not less than 10MHz from a frequency corresponding to an original energy difference between any two of the plurality of energy states.
Inventors:
NOGUCHI ATSUSHI (JP)
OSADA ALTO (JP)
NAKAMURA YASUNOBU (JP)
OSADA ALTO (JP)
NAKAMURA YASUNOBU (JP)
Application Number:
PCT/JP2021/014961
Publication Date:
November 25, 2021
Filing Date:
April 08, 2021
Export Citation:
Assignee:
JAPAN SCIENCE & TECH AGENCY (JP)
International Classes:
H01L39/22; H03K17/92; H03K19/195
Foreign References:
| JP2015165623A | 2015-09-17 | |||
| JP2017073106A | 2017-04-13 | |||
| JP2005527902A | 2005-09-15 | |||
| US10452991B1 | 2019-10-22 |
Attorney, Agent or Firm:
KYOTO INTERNATIONAL PATENT LAW OFFICE (JP)
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