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Easy-to-expand and high-fidelity superconducting quantum chip structure and operation method

A superconducting quantum, high-fidelity technology, applied in quantum computers, semiconductor devices, instruments, etc., can solve the problems of slow thermal operation, control signal crosstalk, serious parasitic coupling, etc., and achieve small parasitic coupling and special modulation signals. The effect of small crosstalk and long decoherence time

Active Publication Date: 2021-02-05
深圳市福田区南科大量子技术与工程研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In view of the above problems, the purpose of the present invention is to provide an easy-to-expand, high-fidelity superconducting quantum chip structure and operation method, which has the characteristics of easy expansion and high-fidelity, and solves the problem of parasitic coupling in traditional superconducting quantum chips. Serious, serious control signal crosstalk, complex control circuit, slow operation speed of insulation heat, etc.

Method used

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  • Easy-to-expand and high-fidelity superconducting quantum chip structure and operation method
  • Easy-to-expand and high-fidelity superconducting quantum chip structure and operation method

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Embodiment 1

[0048] Such as Figure 1(a) ~ Figure 1(d) As shown, the present invention proposes an easily expandable, high-fidelity superconducting quantum chip structure, the superconducting quantum chip includes several adjustable couplers (marked as "C" in the figure) and fixed frequency and designed at Several qubits (labeled "Q" in the figure) of different frequency bands. Among them, qubits and adjustable couplers are arranged alternately, and the static frequency of the adjustable coupler, adjacent qubits, and frequencies of qubits adjacent to the same adjustable coupler are all in different frequency bands; each quantum Each bit is provided with a separate microwave drive line XY, and any single-bit gate can be realized by applying a resonant excitation signal on the microwave drive line XY; each adjustable coupler is provided with a separate magnetic flux bias line Z, through By applying a frequency-modulated signal on the flux bias line Z, a two-bit gate or an arbitrary multi-bi...

Embodiment 2

[0079] Such as Figure 2 ~ Figure 4 As shown, this embodiment explains part of the present invention in more detail; this embodiment belongs to a special situation in the first embodiment.

[0080] Such as figure 2 Shown is a schematic diagram of a one-dimensionally arranged superconducting quantum chip and the corresponding control circuit. In the superconducting quantum chip, qubits and adjustable couplers are arranged in a ratio of 1:1. Among them, both the qubit and the adjustable coupler adopt the transmission sub-qubit structure. The transmission sub-qubit is formed by parallel connection of a Josephson junction (or superconducting quantum interference device) and a large capacitor. The parallel capacitor is composed of a flat plate to the ground. The typical value of the parallel capacitance is 70-100fF, and the typical value of the critical current of the Josephson junction is 20nA; the superconducting quantum interference device in the adjustable coupler is composed ...

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Abstract

The invention relates to an easy-to-expand and high-fidelity superconducting quantum chip structure and an operation method. The superconducting quantum chip structure is characterized by comprising aplurality of adjustable couplers and a plurality of quantum bits; wherein the quantum bits and the adjustable couplers are arranged alternately, and the static frequency of the adjustable couplers, the adjacent quantum bits and the frequencies of the quantum bits adjacent to the same adjustable coupler are located in different frequency bands; each quantum bit is provided with an independent microwave driving line XY, wherein each adjustable coupler is provided with an independent magnetic flux bias line Z, and a single-bit gate, a two-bit gate or a multi-bit controlled phase gate is realizedby applying a driving signal to the microwave driving line XY or the magnetic flux bias line Z. The method can be widely applied to the field of superconducting quantum computing.

Description

technical field [0001] The invention relates to an easily expandable, high-fidelity superconducting quantum chip structure and an operation method, belonging to the field of superconducting quantum computing. Background technique [0002] Compared with other physical solutions to realize quantum computing, the advantage of superconducting quantum computing mainly lies in its stronger scalability. Superconducting quantum computing uses artificial atoms (qubits) as the basic control unit. Although there is no difficulty in principle in manufacturing superconducting quantum chips containing a large number of qubits, more defects will be introduced when expanding superconducting quantum chips, such as Issues such as crosstalk between control lines and multi-bit parasitic coupling affect the fidelity of quantum gates. How to ensure high-fidelity quantum gates while expanding superconducting quantum chips is an important problem to be solved to realize large-scale superconducting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/18G06N10/00H10N69/00
CPCG06N10/00H10N69/00
Inventor 燕飞储继刘松俞大鹏
Owner 深圳市福田区南科大量子技术与工程研究院
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