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Superconducting quantum bit structure with adjustable adjacent bit coupling strength

A technology of superconducting quantum and coupling strength, applied in the field of quantum computing, can solve problems such as the limitation of CZ gate fidelity, and achieve the effect of improving accuracy, high scalability, and promoting application

Active Publication Date: 2019-05-21
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in existing multi-qubit systems, it is difficult for adjacent qubits with fixed coupling strength to completely shut

Method used

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  • Superconducting quantum bit structure with adjustable adjacent bit coupling strength
  • Superconducting quantum bit structure with adjustable adjacent bit coupling strength
  • Superconducting quantum bit structure with adjustable adjacent bit coupling strength

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Embodiment Construction

[0042] The disclosure provides a superconducting qubit structure with adjustable adjacent bit coupling strength, and the Josephson junction L of the coupling loop k The two ends are respectively connected to the capacitance C of the two superconducting qubit lines 1 、C 2 with the corresponding inductance and Between, two superconducting qubits through L k Inductive coupling is formed, and by adjusting the magnetic flux of the coupling loop, the L k The adjustment of the equivalent inductance, thereby adjusting the coupling strength between two superconducting qubits, and can realize the switching off of the coupling strength between adjacent qubits, further improving the fidelity of the double-qubit CZ gate, thereby The accuracy of quantum computing is improved, and the superconducting qubit structure has high scalability, which promotes the application of superconducting quantum computing.

[0043]In order to make the purpose, technical solutions and advantages of the ...

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Abstract

The invention discloses a superconducting quantum bit structure with adjustable adjacent bit coupling strength. The superconducting quantum bit line comprises a first superconducting quantum bit line,including a capacitor C1, an inductance (shown in the specification) and a Josephson junction (shown in the specification). The capacitor C1 is connected with the inductor C1 in series, and the capacitor C1 is connected with the inductor C1 in series. The capacitor C1 is connected with the inductor C1 in series. The inductor C1 is connected with the inductor C1 in series. The capacitor C1 and theinductor (1) are connected in series, and the capacitor C1 and the inductor (1) are connected in parallel after the capacitor C1 and the inductor (1) are connected in series. The capacitor C1 and theinductor (1) are connected in series. Two ends of each of the first end and the second end of each of the first end, the second end and the third end. The superconducting quantum bit line also comprises a second superconducting quantum bit line, including a capacitor C2, an inductance (shown in the specification) and a Josephson junction (shown in the specification). The capacitor C2 and the inductor C2 are connected in series, and the inductor C2, the capacitor C2 and the inductor C2 are connected in series. The capacitor C2, the inductor C2 and the inductor C2 are connected in series. Capacitor C2 and inductor (shown in the specification) which are connected in series are connected to the capacitor C2 and the inductor (shown in the specification) in parallel, and the capacitor C2 and the inductor (shown in the specification) are connected to the capacitor C2 and the inductor (shown in the specification) in series. The number of the terminals is two, and the number of the terminals is two. The superconducting quantum bit structure also comprises a coupling loop, including a Josephson junction Lk forming a loop, an inductance (shown in the description) and an inductance (shown inthe description) as well as inductance (shown in the description) wherein the formula (1) is shown in the specification, and the formula (2) is shown in the specification. One end of the Josephson junction Lk is connected between the capacitor C1 and the inductor (please see the formula in the specification), and the other end of the Josephson junction Lk is connected between the capacitor C1 andthe inductor (please see the formula in the specification). The other end of the capacitor C2 is connected between the capacitor C2 and the inductor (please see the formula in the specification). Theother end of the capacitor C2 is connected between the capacitor C2 and the inductor (please see the formula in the specification); Inductance (shown in the description) and inductance (shown in the description) as well as inductance (shown in the description) According to the structure, the fidelity of the double-quantum-bit CZ gate is further improved, so that the precision of quantum calculation is improved, the expansibility is high, and the application of superconducting quantum calculation is promoted.

Description

technical field [0001] The disclosure belongs to the technical field of quantum computing, and relates to a superconducting qubit structure with adjustable adjacent bit coupling strength. Background technique [0002] As the size of transistor chips is getting smaller and closer to the limit, the computing performance of traditional classical computers is gradually reaching its peak. Quantum computer is a potential alternative to existing classical computers. Its principles and related algorithms have been extensively studied in the last century. Quantum computing has principles in many mathematical problems such as factorization of large prime numbers and global search. solution speed advantage. Scientists have now established different quantum systems and implemented some simple quantum algorithms, among which superconducting quantum computing is the most promising quantum computing system. [0003] In quantum computing systems, the most important thing is to realize hig...

Claims

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Application Information

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IPC IPC(8): G06N10/00
Inventor 叶杨森李少炜查辰邓辉龚明吴玉林梁福田廖胜凯彭承志朱晓波潘建伟
Owner UNIV OF SCI & TECH OF CHINA
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