信息工程大学学报2026，Vol.27Issue(2)：192-198,7.DOI:10.3969/j.issn.1671-0673.2026.02.009
楔形沟槽结构Transmon量子比特的表面损耗仿真及分析
Surface Loss Simulation and Analysis of Wedge Trench Geometry Transmon Qubits
摘要
Abstract
To address the challenge that surface loss mitigation in superconducting Transmon qubits becomes progressively saturated in conventional vertical trench geometries,making it difficult to fur‑ther improve coherence,a wedge trench geometry is introduced into the Transmon qubits to further re‑duce the surface loss of qubits.Firstly,a parameterized model of the wedge trench Transmon is estab‑lished,and key geometric parameters,including the sidewall opening angle and trench depth,are iden‑tified.Secondly,finite-element electromagnetic simulations are performed to evaluate the interface en‑ergy participation ratios under different parameter sets,from which the variation trend of the total sur‑face loss is obtained.Finally,a comparative assessment is carried out under conditions where the verti‑cal trench depth mitigation approaches saturation.The results indicate that the wedge trench geometry further suppresses the total surface loss and improve the surface loss-related quality factor by 25.4%,which provides a new structural design route for enhancing qubit coherence.关键词
超导量子比特/Transmon量子比特/沟槽结构/介质损耗/电磁仿真/品质因子Key words
superconducting qubits/Transmon qubits/trench geometry/dielectric loss/electromag‑netic simulation/quality factor分类
信息技术与安全科学引用本文复制引用
查治国,杨天,袁本政,张潮洁,穆清..楔形沟槽结构Transmon量子比特的表面损耗仿真及分析[J].信息工程大学学报,2026,27(2):192-198,7.基金项目
河南省重大科技专项(221100210400) （221100210400）
