Proposal for manipulating and detecting spin and orbital states of trapped electrons on helium using cavity quantum electrodynamics

TL;DR

This paper proposes a method to manipulate and detect the spin and orbital states of a single electron on helium using cavity quantum electrodynamics, enabling potential quantum information applications.

Contribution

It introduces a novel approach to couple trapped electrons on helium with superconducting cavities for quantum control and readout.

Findings

Estimated motional coherence times exceed 15 microseconds.

Energy exchange with cavity photons occurs in less than 10 nanoseconds for charge states.

Spin states can be coupled faster than 1 microsecond.

Abstract

We propose to couple an on-chip high finesse superconducting cavity to the lateral-motion and spin state of a single electron trapped on the surface of superfluid helium. We estimate the motional coherence times to exceed 15 microseconds, while energy will be coherently exchanged with the cavity photons in less than 10 nanoseconds for charge states and faster than 1 microsecond for spin states, making the system attractive for quantum information processing and cavity quantum electrodynamics experiments. Strong interaction with cavity photons will provide the means for both nondestructive readout and coupling of distant electrons.