Coupling an ensemble of electrons on superfluid helium to a superconducting circuit

Abstract

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 (cQED) 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.

main text 5 pages, 4 figures, supplemental information includes 14 pages, 11 figures

References in corpus (7)

• Strong scaling of general-purpose molecular dynamics simulations on GPUs
• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• Circuit Quantum Electrodynamics with a Spin Qubit
• Coherent coupling of a single spin to microwave cavity photons
• Anisotropic rare-earth spin ensemble strongly coupled to a superconducting resonator
• An incompressible state of a photo-excited electron gas
• Isolating electrons on superfluid helium

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