2017 arxiv Superfluid Optomechanics Tuning a 3D Microwave Cavity via Superfluid Helium at MilliKelvin Temperatures F. Souris,1 H. Christiani,1 and J.P. Davis1, a) Souris et al. Open PDF Download File Information Filename Souris_arxiv_2017.pdf Pages 3 Size 0.97 MB Extraction Quality partial