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Superconducting composite quantum computing circuits

Foreign code F210010337
File No. E128P04TW
Posted date Feb 2, 2021
Country Taiwan
Application number 108139578
Gazette No. I705587
Date of filing Oct 31, 2019
Gazette Date Sep 21, 2020
Title Superconducting composite quantum computing circuits
Abstract The superconducting composite quantum calculation circuit has: a circuit substrate, a wiring pattern having circuit elements comprising quantum bits and observation electrodes for observing the state of quantum bits on the surface of the substrate, and a ground pattern as ground potential, a ground pattern to be formed on a 1 th face in the surface of the substrate, and a through electrode; a ground pattern formed on a 2 th face opposite to the 1 th face connected inside the substrate. The 1 th ground electrode, has a 1 th contact portion in contact with a ground pattern formed on the 1 th face of the circuit substrate, and a 1 th non-contact portion; th 2 th ground electrode, has a 2 th contact portion in contact with a ground pattern formed on the 2 th face of the circuit substrate. A control signal line provided with a contact spring pin at a front end, the contact spring pin is a contact position corresponding to a quantum bit, and pushes the 1 th face of the circuit substrate against the 1 th ground electrode, or pushes the 2 th face of the circuit substrate against the 2 th ground electrode; imparting potential member, pushes the 1 th ground electrode against the 1 th face of the circuit substrate, or pushes the 2 th ground electrode against the 2 th face of the circuit substrate; The 1 th ground electrode is in contact with the ground pattern through the 1 th extension, The 1 th extension is formed by a superconductor having a ductility higher than that of the ground pattern; th 2 th ground electrode is in contact with the ground pattern through the 2 th extension, th 2 th extension is formed by a superconductor having a ductility higher than that of the ground pattern.
Scope of claims [claim1]
1. A superconducting composite quantum calculation circuit, having a: circuit substrate, having a wiring pattern formed on a surface of the substrate with circuit elements comprising quantum bits and observation electrodes observing the state of said quantum bits, and a ground potential, i. e., a ground pattern, and having through electrodes, said through electrodes being to be formed on a 1 th face of said substrate surface, and said ground pattern being formed on an opposite face of said 1 th face, a 2 th face, The 1 th ground electrode, is provided with a 1 th contact portion in contact with the aforementioned ground pattern formed at the aforementioned 1 th face of the circuit substrate, and a 1 th non-contact portion in shape corresponding to the shape of the aforementioned wiring pattern formed at the aforementioned 1 th face; th ground electrode, is provided with a 2 th contact portion in contact with the aforementioned ground pattern formed at the aforementioned 2 th face of the circuit substrate; The control signal line, is provided with a contact spring pin at the front end, the aforementioned contact spring pin is a contact position corresponding to the aforementioned quantum bit element, and pushes the aforementioned circuit substrate up, or pushes the aforementioned circuit substrate down; and energizes the potential member, pushes the aforementioned 1 th ground electrode on the aforementioned 1 th face of the aforementioned circuit substrate, or pushes the aforementioned 2 th ground electrode on the aforementioned 2 th face of the aforementioned circuit substrate, The aforementioned 1 th ground electrode is in contact with the aforementioned ground pattern through the 1 th extension, the aforementioned 1 th extension is formed by a superconductor having a ductility higher than that of the aforementioned ground pattern, the aforementioned 2 th ground electrode is in contact with the aforementioned ground pattern through the 2 th extension, the aforementioned 2 th extension is formed by a superconductor having a ductility higher than that of the aforementioned ground pattern.

[claim2]
2. The superconducting composite quantum computing circuit of claim 1, wherein said quantum bit comprises: th electrode, and ground has a 1 th coupling capacitance; and 2 electrode, and ground has a 2 th coupling capacitance greater than said 1 th coupling capacitance, and is connected to said 1 th electrode by Joseph Son bonding.

[claim3]
3. The superconducting composite quantum calculation circuit, of claim 2 wherein said circuit substrate has a center electrode, a surrounding electrode surrounding said center electrode, and a connecting electrode connecting said center electrode to said surrounding electrode at a quantum bit corresponding position, said quantum bit corresponding position being a position in said 2 th plane corresponding to said quantum bit included in said distribution pattern formed in said 1 th plane.

[claim4]
4. The superconducting composite quantum computing circuit as claimed in any one of claims 1 to 3, wherein said control signal line is at a position corresponding to a position of said quantum bit contained in said distribution pattern formed in said 1 th plane, disposed inside said 1 th ground electrode having said 1 th non-contact portion, Or at a position corresponding to the corresponding position of the qubit, disposed inside the 2 th non-contact portion of the aforementioned 2 th grounded electrode, and supplying a control signal to the aforementioned qubit, the aforementioned qubit corresponding position is the aforementioned position in the 2 th plane corresponding to the aforementioned qubit contained in the aforementioned wiring pattern formed at the aforementioned 1 th plane.

[claim5]
5. The superconducting composite quantum computing circuit, of claim 4 wherein the width and height of said 1 th contactless portion and said 2 th contactless portion are smaller dimensions than the wavelength of said control signal.

[claim6]
6. The superconducting composite quantum computing circuit, of claim 5 wherein the frequency band of said control signal is a microwave frequency band.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • NAKAMURA YASUNOBU
  • TABUCHI YUTAKA
  • TAMATE SHUHEI
IPC(International Patent Classification)
Reference ( R and D project ) ERATO NAKAMURA Macroscopic Quantum Machines AREA
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