楔形沟槽结构Transmon量子比特的表面损耗仿真及分析OA

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.