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arXiv 1201.5299cond-mat.mes-hall
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两能级系统相互作用引起的超导谐振腔内部损耗

Internal loss of superconducting resonators induced by interacting two level systems

Lara Faoro, Lev B. Ioffe

摘要:

在微波高质量超导共面波导(CPW)谐振器的一些实验中,观察到品质因数的弱功率依赖性。我们认为,这一观察意味着单色辐射不饱和的两个能级系统(TLS)位于界面氧化物表面的谐振器,并建议它们之间的相互作用的重要性。我们估计由于相互作用TLS的微波损耗,并表明TLS之间的相互作用导致其能量的漂移,导致其吸收对辐射功率的对数依赖性慢得多,与数据一致。

英文摘要:

In a number of recent experiments with microwave high quality superconducting coplanar waveguide (CPW) resonators an anomalously weak power dependence of the quality factor has been observed. We argue that this observation implies that the monochromatic radiation does not saturate the Two Level Systems (TLS) located at the interface oxide surfaces of the resonator and suggests the importance of their interactions. We estimate the microwave loss due to interacting TLS and show that the interactions between TLS lead to a drift of their energies that result in a much slower, logarithmic dependence of their absorption on the radiation power in agreement with the data.

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