Cryogenic microwave filter cavity with a tunability greater than 5 GHz
Cryogenic microwave filter cavity with a tunability greater than 5 GHz
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DOI：
10.1063/1.5051042
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发表时间：
2018-11-01
影响因子：
1.6
通讯作者：
Davis, J. P.
中科院分区：
文献类型：
--
作者：
Clark, T. J.;Vadakkumbatt, V.;Davis, J. P.
微波腔的各种应用，如超导量子比特的测量和控制，磁谐振器和相位噪声滤波器，将很好地服务于具有高度可调谐的微波谐振。通常这种可调性是需要在低温下的原位，在那里人们可以利用超导腔。迄今为止，这种低温调谐，同时保持高品质因素已被限制在类似500兆赫兹。在这里，我们展示了一个三维超导微波腔，它与加压体积的氦共享一面墙。氦气室加压后，微波腔体发生变形，导致其谐振频率原位调谐超过5 GHz，大于原8 GHz谐振频率的60%。在整个调谐范围内，腔的质量因子保持在大约7 × 10(3)的近似恒定。为了证明它的实用性，我们实现了一个可调的低温相位噪声滤波器，它将我们的源的相位噪声降低了大约10 dB，高于400 kHz。AIP出版社出版。
A wide variety of applications of microwave cavities, such as measurement and control of superconducting qubits, magnonic resonators, and phase noise filters, would be well served by having a highly tunable microwave resonance. Often this tunability is desired in situ at low temperatures, where one can take advantage of superconducting cavities. To date, such cryogenic tuning while maintaining a high quality factor has been limited to similar to 500 MHz. Here we demonstrate a three-dimensional superconducting microwave cavity that shares one wall with a pressurized volume of helium. Upon pressurization of the helium chamber, the microwave cavity is deformed, which results in in situ tuning of its resonant frequency by more than 5 GHz, greater than 60% of the original 8 GHz resonant frequency. The quality factor of the cavity remains approximately constant at approximate to 7 x 10(3) over the entire range of tuning. As a demonstration of its usefulness, we implement a tunable cryogenic phase noise filter, which reduces the phase noise of our source by approximately 10 dB above 400 kHz. Published by AIP Publishing.