Signal and Charge Transfer Efficiency of Few Electrons Clocked on Microscopic Superfluid Helium Channels

TL;DR

This paper demonstrates highly efficient charge transfer of few electrons on microscopic superfluid helium channels, advancing the potential for quantum information processing with electron spin qubits.

Contribution

It provides the first measurement of charge transfer efficiency for electrons on superfluid helium channels, achieving near-perfect transfer at high frequency.

Findings

Charge transfer efficiency of 0.99999992 at 800 kHz

Electrons on helium can be reliably transported with minimal loss

Potential for scalable quantum computing with helium-based charge-coupled devices

Abstract

Electrons floating on the surface of liquid helium are possible spin-qubits for quantum information processing. Varying electric potentials are not expected to modify spin states, which allows their transport on helium using a charge-coupled device (CCD)-like array of underlying gates. This approach depends upon efficient inter-gate transfer of individual electrons. Measurements are presented here of the charge transfer efficiency (CTE) of few electrons clocked back and forth above a short microscopic CCD-like structure. A charge transfer efficiency of 0.99999992 is obtained for a clocking frequency of 800 kHz.