Optimization of infrared and magnetic shielding of superconducting TiN and Al coplanar microwave resonators
Optimization of infrared and magnetic shielding of superconducting TiN and Al coplanar microwave resonators
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DOI：
10.1088/0953-2048/29/10/104002
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发表时间：
2016-10-01
影响因子：
3.6
通讯作者：
Siddiqi, I.
中科院分区：
文献类型：
--
作者：
Kreikebaum, J. M.;Dove, A.;Siddiqi, I.
本文系统地研究了屏蔽对用于量子相干电路的Al和TiN微波谐振腔的内部品质因数（Q（i））的影响。在绝热退磁冰箱中进行测量，其中典型的磁场为200 μ T存在于未屏蔽的样品阶段。辐射屏蔽包括100和500 mK铜罐涂有红外吸收环氧树脂。磁屏蔽由Cryoperm 10和Cu罐的Sn镀层组成。一个2.7 K的辐射可以和同轴热化过滤器在所有的测量。在100 mK下Q（i）= 1.3 x 10（6）的TiN样品在有限屏蔽下测试时，品质因数没有显著变化。相比之下，Al谐振器显示出具有连续屏蔽的改善的Qi，其中从添加第一辐射和磁屏蔽获得最大增益，并且在添加Sn镀红外吸收环氧树脂之前饱和。
We present a systematic study of the effects of shielding on the internal quality factors ( Q(i)) of Al and TiN microwave resonators designed for use in quantum coherent circuits. Measurements were performed in an adiabatic demagnetization refrigerator, where typical magnetic fields of 200 mu T are present at the unshielded sample stage. Radiation shielding consisted of 100 and 500 mK Cu cans coated with infrared absorbing epoxy. Magnetic shields consisted of Cryoperm 10 and Sn plating of the Cu cans. A 2.7 K radiation can and coaxial thermalization filters were present in all measurements. TiN samples with Q(i)= 1.3 x 10(6) at 100 mK exhibited no significant variation in quality factor when tested with limited shielding. In contrast, Al resonators showed improved Qi with successive shielding, with the largest gains obtained from the addition of the first radiation and magnetic shields and saturating before the addition of Sn plating infrared absorbing epoxy.