Quasiparticle Lifetime and Noise in Tantalum High Q Superconducting Resonators
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- 作者：R. Barends ; J. J. A. Baselmans ; S. J. C. Yates ; J. R. Gao ; J. N. Hovenier and T. M. Klapwijk
- 关键词：Quasiparticle lifetime ; Kinetic inductance ; Resonator ; Tantalum
- 刊名：Journal of Low Temperature Physics
- 出版时间：April, 2008
- 出版年：2008
- 期刊代码：20_00222291
- 类别：law
- 卷：151
- 期：1-2
- 页码：518-523
- 数据来源：sp
摘要
We present measurements of the quasiparticle lifetime using optical pulses in the temperature range of 50 mK–1 K as well as measurements of the noise spectrum under continuous illumination in planar tantalum resonators. When decreasing the temperature the quasiparticle lifetime increases until it enters a saturation regime, reaching lifetime values of up to 35 μs at around 650 mK which decrease to a value of around 25 μs below a temperature of 350 mK. The noise spectrum follows a single pole Lorentzian spectrum, indicating that the quasiparticle lifetime is the only relevant timescale.