Superfluid optomechanics: coupling of a superfluid to a superconducting condensate

L A De Lorenzo, K C Schwab
2014 New Journal of Physics  
We investigate the low loss acoustic motion of superfluid 4 He parametrically coupled to a very low loss, superconducting Nb, TE011 microwave resonator, forming a gram-scale, sideband resolved, optomechanical system. We demonstrate the detection of a series of acoustic modes with quality factors as high as 7 · 10 6 . At higher temperatures, the lowest dissipation modes are limited by an intrinsic three phonon process. Acoustic quality factors approaching 10 11 may be possible in isotopically
more » ... in isotopically purified samples at temperatures below 10 mK. A system of this type may be utilized to study macroscopic quantized motion and as an ultra-sensitive sensor of extremely weak displacements and forces, such as continuous gravity wave sources.
doi:10.1088/1367-2630/16/11/113020 fatcat:rut4hirlsbafhftv2jynp4cdp4