  Electrons floating on the surface of liquid helium are possible qubits for
quantum information processing. Varying electric potentials do not modify spin
states, which allows their transport on helium using a charge-coupled device
(CCD)-like array of underlying gates. This scheme depends upon efficient
inter-gate electron transfer and on the absence of electron traps. We will
present a measurement of the charge transfer efficiency (CTE) of electrons
clocked back and forth above a short CCD-like structure. The CTE obtained at
low clocking frequencies is 0.999 with an electron density of about 4 electrons
per square micrometer. We find no evidence for deep electron trapping.

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