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arXiv 2203.05054quant-phcond-mat.mes-hall
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超导谐振器中介质损耗的模拟:Nb/氧化物界面原子二能级系统相互作用的证据

Modelling dielectric loss in superconducting resonators: Evidence for interacting atomic two-level systems at the Nb/oxide interface

N. Gorgichuk, T. Junginger, R. de Sousa

摘要:

虽然有几个实验声称,非晶表面/界面中的两能级系统(TLS)缺陷是超导谐振器和量子比特中能量弛豫的原因,但没有一个实验能用传统的非相互作用TLS模型对其数据进行定量解释。在这里,提出了一个模型,插值之间的相互作用和非相互作用的TLS损耗角正切进行数值分析的实验数据和提取有关TLS参数及其分布的信息。作为一个证明的原则,该模型适用于TESLA腔,只包含一个单一的有损耗的材料在其内部,铌/铌氧化物界面。最佳拟合显示薄(5 nm)和厚(100 nm)氧化物的相互作用的TLS与尖锐的电偶极矩模量,表明TLS是“原子”,而不是“玻璃态”。所提出的方法可以应用于具有多个材料界面和衬底的其他器件,目的是阐明导致谐振器和量子比特中能量损失的TLS的性质。

英文摘要:

While several experiments claim that two-level system (TLS) defects in amorphous surfaces/interfaces are responsible for energy relaxation in superconducting resonators and qubits, none can provide quantitative explanation of their data in terms of the conventional noninteracting TLS model. Here a model that interpolates between the interacting and noninteracting TLS loss tangent is proposed to perform numerical analysis of experimental data and extract information about TLS parameters and their distribution. As a proof of principle, the model is applied to TESLA cavities that contain only a single lossy material in their interior, the niobium/niobium oxide interface. The best fits show interacting TLSs with a sharp modulus of electric dipole moment for both thin (5 nm) and thick (100 nm) oxides, indicating that the TLSs are "atomic" instead of "glassy". The proposed method can be applied to other devices with multiple material interfaces and substrates, with the goal of elucidating the nature of TLSs causing energy loss in resonators and qubits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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