Currently, I have been attempting to focus my efforts on utilizing the unique quantum properties of superfluid helium-4 to realize quantum devices such as qubits and matter-wave interferometers, and ultra-sensitive detection of forces and accelerations. We have coupled a gram-scale acoustic resonator of helium to a very low dissipation superconducting microwave cavity which realized the first superfluid optomechanical system (New J. Phys. 2014) and have observed extraordinary acoustic quality factors in excess of 100 million (JLTP 2017). We expect this system to demonstrate the lowest acoustic loss of any material and to find application in the detection of narrow band gravitational wave from pulsars (New J. Phys. 2018) and the exploration of quantum physics at extremely small length scales. Furthermore, we are exploring the transport of liquid helium through new 2D nanoporous materials (created by Prof. Ben King at Univ. of Nevada Reno) which is expected to demonstrate the Josephson effect far below the superfluid transition temperature and be the basis of ultra-sensitive matter-wave interference gyroscopes and superfluid quantum information devices.
