Accurate Real-Time Monitoring of Quality Factor and Center Frequency of Superconducting Resonators
Accurate Real-Time Monitoring of Quality Factor and Center Frequency of Superconducting Resonators
复制标题
超导谐振器品质因数和中心频率的精确实时监测
DOI：
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发表时间：
2014
影响因子：
1.8
通讯作者：
S. Kubatkin
中科院分区：
文献类型：
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作者：
S. D. de Graaf;A. Danilov;S. Kubatkin
本文采用改进的Pound-Drever-Hall锁频方法，对超导微波谐振器的中心频率和品质因数进行了高精度跟踪。品质因数测量可以用足够高的带宽来实时研究超导谐振器中的不同过程。有了这一附加功能，频率读出不会受到影响，典型的精度约为10-30 Hz/√(Hz)，而空腔损耗率可以在毫秒时间尺度(34 dB/√(Hz))上确定为0.1%以内。正如我们所展示的，这对于电子自旋共振测量特别有用，在这种测量中，基于品质因数测量，我们实现了耦合到谐振器N=5·105自旋/√(赫兹)的最小可检测自旋数量。它还可以在短时间尺度上研究这些设备中的快速动态过程，例如涡旋动力学。
In this paper, we track both center frequency and quality factor of a superconducting microwave resonator with very high precision using a modified Pound-Drever-Hall frequency locking scheme. The quality factor measurements can be done with high enough bandwidth to study different processes in a superconducting resonator in real time. With this added functionality, the frequency readout remains unaffected, with typical accuracy around 10-30 Hz/√(Hz), whereas the cavity loss rate can be determined to within 0.1% on a millisecond time scale (34 dB/√(Hz)). As we demonstrate, this can be particularly useful for electron spin resonance measurements, where we achieve a minimum number of detectable spins coupled to the resonator N = 5 ·105 spins/√(Hz), based on quality factor measurements. It also enables the study of fast dynamic processes, for example, vortex dynamics, in these devices on a short time scale.
超导谐振器中的慢噪声过程
影响因子：
3.7
作者：
Burnett J
通讯作者：
Burnett J