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QUANTUM GATE DEVICE

外国特許コード F210010496
整理番号 E128P09WO
掲載日 2021年7月29日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2020JP008489
国際公開番号 WO 2021029095
国際出願日 令和2年2月28日(2020.2.28)
国際公開日 令和3年2月18日(2021.2.18)
優先権データ
  • 特願2019-148136 (2019.8.9) JP
発明の名称 (英語) QUANTUM GATE DEVICE
発明の概要(英語) This quantum gate device 10 comprises a first superconducting circuit 11 that resonates at a first resonance frequency, a second superconducting circuit 12 that resonates at a second resonance frequency, and a connection part 13 that connects the first and second superconducting circuits 11 and 12. The first superconducting circuit 11 comprises a first Josephson element 111, a second Josephson element group 112, and a first capacitor 114. The second Josephson element group 112 is formed by connecting n Josephson elements in series to a wiring made of a superconductor, and the Josephson energy possessed by each of the n Josephson elements is n times larger than that of the first Josephson element 11. A first wiring 115 forms a partial superconducting circuit 113 by connecting the first Josephson element 111 and the second Josephson element group 112 in an annular shape, and further connects the partial superconducting circuit 113 and the first capacitor 144 in parallel to each other. The quantum gate device 10 further has: a magnetic field application unit 14 that applies a static magnetic field into the partial superconducting circuit 113; and an electromagnetic wave irradiation unit (first electromagnetic wave irradiation unit 151) that irradiates the first superconducting circuit 11 and/or the second superconducting circuit 12 with an electromagnetic wave having a difference frequency corresponding to a difference between the first resonance frequency and the second resonance frequency.
従来技術、競合技術の概要(英語) BACKGROUND ART
In recent years, quantum computers have been actively researched and developed. In conventional computers, calculations are performed with data expressed as either binary (generally, "0" or "1") as the minimum unit, whereas in quantum computers, calculations are expected to be performed with the superimposed state of the two states handled by quantum mechanics as the minimum unit.
In a conventional computer, an operation referred to as a logical gate is performed in which data is input, logical operations such as and (AND), logical sum (OR), and logical negative (NOT) are performed, and the result is output. Similarly, in a quantum computer, an operation called a quantum gate is performed in which data is input, a predetermined logic operation is performed, and the result is output. A device that performs such an operation is referred to as a quantum gate device. In a quantum gate device, as a premise of realizing a superimposed state of two states, it is necessary to selectively adopt two states from a large number of quantum-mechanically discretized states (a state other than the two is not adopted).
NpL 1 describes a circuit referred to as a transmon (transmon), which is a constituent element of a quantum gate device. A transmon is a circuit in which one Josephson element and one capacitor are annularly connected by wiring made of a superconducting material. Here, the Josephson device includes two superconductors sandwiched between thin films made of an insulator.
When the quantum gate device is cooled to a temperature at which the superconductors of the Josephson device and the wiring become superconductive, a current flows in the transmon to pass through the Josephson device due to the Josephson effect. As a result, the transmon functions as a resonant circuit, which assumes any of a plurality of discrete energy states by quantum-mechanical action. Due to the presence of the Josephson elements in the resonant circuit, a plurality of energy states are arranged at unequal intervals. Therefore, when an electromagnetic wave having an energy corresponding to the smallest interval is incident on the Josephson element, the transmon can selectively adopt only two energy states, namely a ground state and one excited state (note that In a circuit obtained by removing the Josephson element from the transmon, a plurality of energy states are arranged at equal intervals, and when an electromagnetic wave having an energy corresponding to that interval is incident thereon, three or more energy states are obtained). In this manner, a quantum gate device is constructed from a plurality of or a combination of one or a plurality of the transsmons and other circuits, which takes only two energy states.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • NOGUCHI, Atsushi
  • NAKAMURA, Yasunobu
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
参考情報 (研究プロジェクト等) ERATO NAKAMURA Macroscopic Quantum Machines AREA
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