An extensible superconducting quantum bit structure

Abstract

The invention discloses an extensible superconducting quantum bit structure which comprises a plurality of superconducting quantum bit lines, each superconducting quantum bit line comprises at least one Josephson junction structure, and each Josephson junction structure is a Josephson junction, or a plurality of Josephson junctions, or a combination of the Josephson junction and an auxiliary line;a capacitor and an inductor which are directly connected with the Josephson junction; a coupler circuit which is used for adjusting the coupling strength between the superconducting quantum bits connected with the coupler, and the coupling strength can be adjusted to be close to or equal to zero; an overline which is used for connecting the superconducting quantum bit line and the ground on the two sides of the coupler line; Wherein the number of the capacitors directly connected with the Josephson junction is multiple, and the superconducting quantum bits are coupled with other circuits through a branch structure formed by the plurality of capacitors. The structure has the advantages of high precision, high expansibility and low crosstalk, 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 an expandable superconducting qubit structure. 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 high-fidelity single-qubit gates and d...

AI Technical Summary

Problems solved by technology

However, in existing multi-qubit systems, it is difficult for adjacent qubits with fixed coupling strength to completely shut off the coupling between each other, so the fidelity of CZ gates in these multi-qubit systems is limited to a certain extent.

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