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Superconducting quantum bit regulation and control method based on crosstalk analysis

A superconducting quantum and bit technology, which is applied in the field of superconducting qubit control based on crosstalk analysis, can solve problems affecting superconducting qubit control, magnetic flux crosstalk, and increasing uncertainty in superconducting qubit control

Active Publication Date: 2019-11-22
ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
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Problems solved by technology

[0005] When there are two or more superconducting qubits on the quantum chip, there is a phenomenon of magnetic flux crosstalk between the superconducting qubits (that is, the bias flux current of one superconducting qubit is connected to the current of another superconducting qubit). The interference between superconducting quantum interference devices of bits), which increases the uncertainty of superconducting qubit regulation and affects the regulation of superconducting qubit

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  • Superconducting quantum bit regulation and control method based on crosstalk analysis
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  • Superconducting quantum bit regulation and control method based on crosstalk analysis

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Embodiment Construction

[0043] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0044] Theoretically, the superconducting qubit frequency w of a superconducting qubit qi with magnetic flux Φ i The relationship between them is as follows:

[0045]

[0046] where: w qi max It is called the maximum modulation frequency of the superconducting qubit, which is determined by the physical structure of the superconducting quantum interference device corresponding to the superconducting qubit, specifically determined by factors such as the critical current of the superconducting Josephson junction, in this embodiment , this parameter is not used as the research object, it is only defined as the maximum modulation frequency of the superconducting qubit; w qi max is the constant of proportionality; Φ 0 is the quantum magnetic flux, which is a physical constant, and its expres...

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Abstract

The invention belongs to the field of quantum chip measurement and control and especially relates to a superconducting quantum bit regulation and control method based on crosstalk analysis. The methodcomprises the following steps: calibrating all superconducting quantum bits on a quantum chip one by one under the condition that only a single bias magnetic flux current with adjustable size is applied to the quantum chip; obtaining a calibration value of a superconducting quantum bit maximum modulation frequency of each superconducting quantum bit, a calibration value of an internal mutual inductance coupling coefficient, a calibration value of an environment bias magnetic flux and a calibration value of an external mutual inductance coupling coefficient; determining a first equation expression for expressing the relationship between the superconducting quantum bit magnetic flux and the bias magnetic flux current; and determining a target magnetic flux of superconducting quantum bits tobe regulated and controlled, and substituting the target magnetic flux into the first equation expression to solve a bias magnetic flux current value corresponding to the superconducting quantum bitsto be regulated and controlled. According to the invention, the determinacy of superconducting quantum bit regulation and control is improved.

Description

[0001] Cross References to Related Applications [0002] This application claims the priority of a Chinese patent application with application number 2018114971610 and titled "A Qubit Control Method Based on Crosstalk Analysis" filed with the China Patent Office on December 07, 2018, the entire contents of which are incorporated herein by reference Applying. technical field [0003] The invention belongs to the field of quantum chip measurement and control, in particular to a superconducting qubit control method based on crosstalk analysis. Background technique [0004] Each superconducting qubit set on the quantum chip is set on a cross-shaped capacitor on the quantum chip and an adjustable superconducting quantum interference device (Superconducting quantum interference device, SQUID) connected in parallel with the capacitor, such as figure 1 As shown, the modulation of the superconducting quantum interference device includes two aspects. The first aspect refers to applyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 孔伟成
Owner ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
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