2015/08/20 by Ge Yang, A. Fragner, G. Koolstra +8 · 50 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Condensed matter physics #Coupling (piping) #Electron #Helium #Materials science #Nuclear physics #Physics #Quantum and electron transport phenomena #Quantum, superfluid, helium dynamics #Superconductivity #Superfluid helium-4 #Superfluidity #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevx.6.011031
published in Physical Review X 6(1) (American Physical Society) · main text 5 pages, 4 figures, supplemental information includes 14 pages, 11 figures
arxiv created 2015/08/20 · openalex publication_date 2016/03/21 · arxiv updated 2016/03/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
The quantized lateral motional states and the spin states of electrons trapped on the surface of superfluid helium have been proposed as basic building blocks of a scalable quantum computer. Circuit quantum electrodynamics allows strong dipole coupling between electrons and a high-Q superconducting microwave resonator, enabling such sensitive detection and manipulation of electron degrees of freedom. Here, we present the first realization of a hybrid circuit in which a large number of electrons are trapped on the surface of superfluid helium inside a coplanar waveguide resonator. The high finesse of the resonator allows us to observe large dispersive shifts that are many times the linewidth and make fast and sensitive measurements on the collective vibrational modes of the electron ensemble, as well as the superfluid helium film underneath. Furthermore, a large ensemble coupling is observed in the dispersive regime during experiment, and it shows excellent agreement with our numeric model. The coupling strength of the ensemble to the cavity is found to be 1 MHz per electron, indicating the feasibility of achieving single electron strong coupling.