Towards Strong Coupling in Single Electron-on-Helium Systems

Electrons levitating on the surface of superfluid helium offer a unique approach to hybrid quantum information science. Coupling the translational motion of trapped electrons to the microwave field of a superconducting resonator establishes a platform that leverages cavity QED techniques for readout of electron states in tandem with the versatility provided by the high mobility of electrons on the helium surface. Electrons are isolated in a "dot" whose electrostatic potential is shaped with an array of nearby electrodes in order to set the electron motional frequencies while we utilize thin film disordered superconductors to increase the coupling between the electrons and the resonator. We attempt to minimize the linewidth due to helium surface variations of the electron motional states through a vibration-insensitive design and present our latest experiments towards strongly coupling the translational state of a single electron on helium to a superconducting resonator.