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Published February 2017 | Submitted
Journal Article Open

Ultra-High Q Acoustic Resonance in Superfluid ^4He

Abstract

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 1.4×10^8, consistent with the dissipation due to dilute ^3He 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.

Additional Information

© 2016 Springer Science+Business Media New York. Received: 26 July 2016; Accepted: 07 October 2016; First Online: 07 November 2016. We acknowledge funding provided by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (NSF IQIM-1125565) with support of the Gordon and Betty Moore Foundation (GBMF-1250) NSF DMR-1052647, and DARPA-QUANTUM HR0011-10-1-0066. L.D. acknowledges support from the NSF GRFP under Grant No. DGE-1144469.

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August 19, 2023
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