Ultra-High Q Acoustic Resonance in Superfluid \(^4\) He

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• 作者：L. A. De Lorenzo ; K. C. Schwab
• 刊名：Journal of Low Temperature Physics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：186
• 期：3-4
• 页码：233-240
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials;
• 出版者：Springer US
• ISSN：1573-7357
• 卷排序：186

文摘

We report the measurement of the acoustic quality factor of a gram-scale, kilohertz-frequency superfluid resonator, detected through the parametric coupling to a superconducting niobium microwave cavity. For temperatures between 400 mK and 50 mK, we observe a \(T^{-4}\) temperature dependence of the quality factor, consistent with a 3-phonon dissipation mechanism. We observe Q factors up to \(1.4\times 10^8\), consistent with the dissipation due to dilute \(^3\)He impurities, and expect that significant further improvements are possible. These experiments are relevant to exploring quantum behavior and decoherence of massive macroscopic objects, the laboratory detection of continuous gravitational waves from pulsars, and the probing of possible limits to physical length scales.