南京大学学报（自然科学版）2025，Vol.61Issue(5)：835-844,10.DOI:10.13232/j.cnki.jnju.2025.05.012
超导qutrit中的CZ门优化
Optimization of CZ gate in superconducting qutrit
摘要
Abstract
A high-performance qutrit CZ gate is an indispensable component for the development of high-level quantum computing and holds great significance for achieving fault-tolerant quantum computing.This paper proposes an optimization scheme for the CZ gate in superconducting qutrits.The main principle of the scheme is to facilitate a tunable ZZ coupling interaction between qutrits with the assistance of the coupler,thus enabling the implementation of the qutrit CZ gate.Through simulation studies,the feasibility of the qutrit CZ gate has been demonstrated.To enhance its precision,we conducted an in-depth analysis of the primary factor influencing the performance of the qutrit CZ gate during its implementation,namely,the origin of non-adiabatic state leakage.To mitigate state leakage,we designed an optimization scheme for the flux pulse based on the Slepian window function and dynamic adjustment of the non-adiabatic factor,and verified the efficacy of the scheme.The optimization scheme for the CZ gate in qutrit proposed in this paper can effectively suppress the state leakage in the process of qutrit CZ gate and enhances adiabatic performance.The scheme can shorten the ramping time of the flux waveform to 70 ns and keep the overall state leakage at 3×10-3 in theoretical simulation.This research provides an effective solution for achieving high-performance qutrit CZ gate.关键词
qutrit/耦合器辅助CZ门/非绝热态泄漏/高维度量子计算Key words
qutrit/coupler-assisted CZ gate/non-adiabatic leakage/high-level quantum computing分类
数理科学引用本文复制引用
王诗云,季李畅,李逸文,黄智国,谭新生,于扬..超导qutrit中的CZ门优化[J].南京大学学报（自然科学版）,2025,61(5):835-844,10.基金项目
科技创新2030"量子通信与量子计算机"重大项目(2021ZD0301702),国家自然科学基金(U21A20436),江苏省自然科学基金(BE2021015-1,BK20232002),山东省自然科学基金(ZR2023LZH002) （2021ZD0301702）
