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In this review, we introduce a developing qubit platform:floating-electron-based qubits. Electrons floating in a vacuum above thesurface of liquid helium or solid neon emerge as promising candidates forqubits, especially due to their expected long coherence times. Despite being inthe early stages, a variety of recent experiments from different groups haveshown substantial potential in this role. We survey a range of theoreticalproposals and recent experiments, primarily focusing on the use of the spinstate as the qubit state, wherein the spin and charge states are hybridized.Throughout these proposals and experiments, the charge state is coupled to anLC resonator, which facilitates both the control and readout mechanisms for thespin state via an artificially introduced spin-charge coupling.

Quantum computing using floating electrons on cryogenic substrates: Potential And Challenges