Method and system for modulating quantum control waveform by keeping robustness unchanged

By maintaining the robustness unchanged during the transformation of the qubit-controlled waveform, the original waveform is continuously variable to generate a set of quantum gate waveforms that maintain the same robustness, which solves the problem that robustness cannot be maintained in the prior art, improves the fidelity and robustness of the quantum gate waveform, and realizes the generation of a set of quantum gate waveforms with all rotation angles.

CN119692487AActive Publication Date: 2025-03-25SOUTHERN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202411511622.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-28
Publication Date
2025-03-25
Estimated Expiration
2044-10-28

AI Technical Summary

Technical Problem

The prior art does not consider robustness or cannot maintain robustness in the transformation process of qubit-controlled waveforms, resulting in low fidelity of the optimization algorithm for quantum gate waveforms and cannot achieve a set of quantum gate waveforms with all rotation angles, resulting in limited application.

Method used

By continuously variation within the rotation range of the original quantum waveform while maintaining the robustness unchanged, a set of quantum gate waveforms maintaining the same robustness is generated. The specific steps include generating a prevariscent function based on the original waveform, converting it into an orthogonal component group, retaining components perpendicular to the gradient of the robust function, correcting the components to obtain the variation function, calculating the quantum gate waveform, recording the rotation angle, iterating the continuous variation until all quantum gate waveforms are output.

Benefits of technology

In the continuous variation process, the robustness of any quantum gate waveform remains unchanged, and other evaluation indicators such as fidelity, high-level leakage, total energy, smoothness and bandwidth are improved, and the robust waveform of the quantum gate with continuous parameters can be achieved, and a set of quantum gate waveforms with all rotation angles can be obtained.

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Abstract

The invention relates to a method and a system for modulating a quantum control waveform while keeping robustness unchanged. The method comprises the following steps: generating a first pre-variational function according to an original waveform; converting the first pre-variational function into an orthogonal component group, and reserving a first vertical component vertical to the robustness function gradient so as to keep the robustness unchanged; correcting the first vertical component to obtain a first variational function so as to calculate a first quantum gate waveform, and recording a first rotation angle corresponding to the first quantum gate waveform; and performing iterative continuous variation based on the first quantum gate waveform until all quantum gate waveforms are output. According to the method, robustness can be kept unchanged in the continuous transformation process, other evaluation indexes such as fidelity, high energy level leakage, total energy, smoothness and bandwidth are improved, the robust waveform of the quantum gate with continuous parameters is achieved, and a group of quantum gate waveforms with all rotation angles can be obtained.
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