Ultra-High Q Acoustic Resonance in Superfluid $$^4$$4He
Ultra-High Q Acoustic Resonance in Superfluid $$^4$$4He
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DOI：
10.1007/s10909-016-1674-x
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发表时间：
2016-07
影响因子：
2
通讯作者：
L. A. Lorenzo;K. Schwab
中科院分区：
文献类型：
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作者：
L. A. Lorenzo;K. Schwab
我们报告了克级千赫兹频率超流体谐振器的声学品质因数的测量，该谐振器通过与超导铌微波腔的参数耦合进行检测。对于 400 mK 和 50 mK 之间的温度，我们观察到品质因数的温度依赖性，与 3 声子耗散机制一致。我们观察到 Q 因子高达，与稀释 He 杂质引起的耗散一致，并期望有可能进一步显着改进。这些实验与探索大规模宏观物体的量子行为和退相干、脉冲星连续引力波的实验室检测以及探测物理长度尺度的可能限制有关。
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 atemperature dependence of the quality factor, consistent with a 3-phonon dissipation mechanism. We observeQfactors up to, consistent with the dissipation due to diluteHe 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.