US 2026/0213749 A1Published application

Superconducting quantum circuit element and superconducting quantum computer

AssigneeTohoku University

InventorsTaro YAMASHITA, Tokunoshin UCHIDA

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Abstract

An object of the invention is to provide a magnetic flux type superconducting quantum circuit element and a superconducting quantum computer using the element that can withstand anharmonicity in practical use and achieve high density by not adding a shunt capacitor, and implements improvement in a coherence time. A large-area junction magnetic flux type superconducting quantum circuit element is a superconducting quantum circuit element, the superconducting quantum circuit element is based on a magnetic flux type superconducting quantum circuit element which has three Josephson junctions in one loop and in which an a junction ratio is introduced, the α junction ratio indicating that an area of one Josephson junction among the three Josephson junctions is α times (0.3≤α≤0.7) an area of the other two Josephson junctions having equal areas.

Claims6

Dependent claims

A large-area junction magnetic flux type superconducting quantum circuit element, wherein

the large-area junction magnetic flux type superconducting quantum circuit element is a superconducting quantum circuit element,
the superconducting quantum circuit element is based on a magnetic flux type superconducting quantum circuit element which has three Josephson junctions in one loop and in which an α junction ratio is introduced, the α junction ratio indicating that an area of one Josephson junction among the three Josephson junctions is α times an area of the other two Josephson junctions having equal areas, and
a junction cross-sectional area of each of the three Josephson junctions is set to be large as β times a junction cross-sectional area of the magnetic flux type superconducting quantum circuit element as a base while maintaining the α junction ratio, thereby improving a coherence time,
where 0.3≤α≤0.7, and 2≤β≤200.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 19/142,171Filed 26 Dec 2023
Priority: JP 2023-01962713 Feb 2023
Published: 23 Jul 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H03K 17/92
Characterised by the components used: by the use, as active elements, of superconductive devices
G06N 10/00
Quantum computing, i.e. information processing based on quantum-mechanical phenomena
G06N 10/20
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: models of quantum computing, e.g. quantum circuits or…
G06N 10/40
Quantum computing, i.e. information processing based on quantum-mechanical phenomena: physical realisations or architectures of quantum processors…